PDF文档结构分析一

文章目录

一页空白PDF
- [1. 文件头 (Header)](#1. 文件头 (Header))
- [2. 对象定义 (Object Definitions)](#2. 对象定义 (Object Definitions))
- - [对象 1：文档目录 (Catalog)](#对象 1：文档目录 (Catalog))
  - [对象 2：页面树 (Pages Tree)](#对象 2：页面树 (Pages Tree))
  - [对象 3：修改日期](#对象 3：修改日期)
  - [对象 4：页面对象 (Page)](#对象 4：页面对象 (Page))
- [3. 交叉引用表 (Cross-Reference Table)](#3. 交叉引用表 (Cross-Reference Table))
- [4. 文档尾 (Trailer)](#4. 文档尾 (Trailer))
- 文档特征总结：
五页空白PDF
- [1. 文件头 (Header)](#1. 文件头 (Header))
- [2. 对象定义 (Object Definitions)](#2. 对象定义 (Object Definitions))
- - [对象 2：页面树 (Pages Tree) - **主要变化**](#对象 2：页面树 (Pages Tree) - 主要变化)
  - 新增了4个页面对象 (7-10)
- [3. 交叉引用表 (Cross-Reference Table)](#3. 交叉引用表 (Cross-Reference Table))
- [4. 文档尾 (Trailer)](#4. 文档尾 (Trailer))
- 与之前文档的主要区别：
- - [1. **页面数量**](#1. 页面数量)
  - [2. **对象数量**](#2. 对象数量)
  - [3. **页面对象属性**](#3. 页面对象属性)
  - [4. **文件结构**](#4. 文件结构)
  - [5. **文档ID不同**](#5. 文档ID不同)
  - [6. **修改日期**](#6. 修改日期)
- 推测的可能操作：
文字图像PDF
- [1. 文件头 (Header)](#1. 文件头 (Header))
- [2. 对象定义 (Object Definitions)](#2. 对象定义 (Object Definitions))
- [3. 详细对象分析](#3. 详细对象分析)
- [4. 交叉引用表 (Cross-Reference Table)](#4. 交叉引用表 (Cross-Reference Table))
- [5. 文档尾 (Trailer)](#5. 文档尾 (Trailer))
- 与之前文档的主要区别：
- - [1. **内容变化：从空页面到有内容的页面**](#1. 内容变化：从空页面到有内容的页面)
  - [2. **页面数量减少但内容丰富**](#2. 页面数量减少但内容丰富)
  - [3. **对象数量大幅增加**](#3. 对象数量大幅增加)
  - [4. **文件结构复杂化**](#4. 文件结构复杂化)
  - [5. **文件大小剧增**](#5. 文件大小剧增)
  - [6. **修改日期变化**](#6. 修改日期变化)
  - [7. **页面内容分析**](#7. 页面内容分析)
  - [8. **文档ID再次变化**](#8. 文档ID再次变化)
- 关键特点：

一页空白PDF

cpp 复制代码

%PDF-1.7
%µ¶
% Written by MuPDF 1.27.0

1 0 obj
<<
  /Type /Catalog
  /Pages 2 0 R
>>
endobj

2 0 obj
<<
  /Type /Pages
  /Count 1
  /Kids [ 4 0 R ]
>>
endobj

3 0 obj
<<
  /ModDate (D:20260201101915+08'00')
>>
endobj

4 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
>>
endobj

xref
0 9
0000000005 65535 f 
0000000042 00000 n 
0000000096 00000 n 
0000000162 00000 n 
0000000221 00000 n 
0000000006 00002 f 
0000000007 00002 f 
0000000008 00001 f 
0000000349 00001 f 

trailer
<<
  /Size 9
  /Root 1 0 R
  /ID [ <518807DC94414C29E02FD2A979A55577> <621008229B2755FDD137456AAC1B1AFA> ]
>>
startxref
349
%%EOF

我来逐块分析这个 PDF 文档结构：

复制代码

%PDF-1.7
%µ¶
% Written by MuPDF 1.27.0

PDF 版本：1.7
文件包含二进制数据（%µ¶ 表示二进制内容）
由 MuPDF 1.27.0 生成

2. 对象定义 (Object Definitions)

对象 1：文档目录 (Catalog)

pdf 复制代码

1 0 obj
<<
  /Type /Catalog
  /Pages 2 0 R
>>
endobj

根对象
指向页面树对象（对象 2）

对象 2：页面树 (Pages Tree)

pdf 复制代码

2 0 obj
<<
  /Type /Pages
  /Count 1
  /Kids [ 4 0 R ]
>>
endobj

总页数：1
子页面引用：对象 4

对象 3：修改日期

pdf 复制代码

3 0 obj
<<
  /ModDate (D:20260201101915+08'00')
>>
endobj

修改日期：2026年2月1日 10:19:15（东八区）
注意：这是未来时间（相对于今天2025年）

对象 4：页面对象 (Page)

pdf 复制代码

4 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources << >>
>>
endobj

页面尺寸：595×842 单位（A4 尺寸，单位是点，1/72英寸）
裁剪框与媒体框相同
空资源字典（没有字体、图像等资源）
这是一个空页面

3. 交叉引用表 (Cross-Reference Table)

pdf 复制代码

xref
0 9
0000000005 65535 f 
0000000042 00000 n 
0000000096 00000 n 
0000000162 00000 n 
0000000221 00000 n 
0000000006 00002 f 
0000000007 00002 f 
0000000008 00001 f 
0000000349 00001 f

有 9 个条目（索引 0-8）
格式：偏移量世代号 f/n（f=空闲，n=在用）
对象 1-5 是在用对象，6-8 是空闲对象

4. 文档尾 (Trailer)

pdf 复制代码

trailer
<<
  /Size 9
  /Root 1 0 R
  /ID [ <518807DC94414C29E02FD2A979A55577> <621008229B2755FDD137456AAC1B1AFA> ]
>>
startxref
349
%%EOF

总条目数：9
根对象：对象 1
文档 ID（两个 16 字节的十六进制字符串）
交叉引用表起始位置：349
文件结束标记

文档特征总结：

极简结构：只有必要的 PDF 对象
空页面：没有实际内容（文本、图像等）
A4 尺寸：标准页面大小
线性化：只有一个交叉引用表（非增量更新）
可能用途 ：
- 模板文件
- 测试文件
- 占位文档
- 由程序生成的初始文档

这是一个非常基础的 PDF 文档，仅包含框架结构而无实际可视内容。

五页空白PDF

cpp 复制代码

%PDF-1.7
%µ¶
% Written by MuPDF 1.27.0

1 0 obj
<<
  /Type /Catalog
  /Pages 2 0 R
>>
endobj

2 0 obj
<<
  /Type /Pages
  /Count 5
  /Kids [ 4 0 R 7 0 R 8 0 R 9 0 R 10 0 R ]
>>
endobj

3 0 obj
<<
  /ModDate (D:20260201101954+08'00')
>>
endobj

4 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
>>
endobj

7 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
  /Rotate 0
>>
endobj

8 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
  /Rotate 0
>>
endobj

9 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
  /Rotate 0
>>
endobj

10 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
  >>
  /Rotate 0
>>
endobj

xref
0 13
0000000005 65535 f 
0000000042 00000 n 
0000000096 00000 n 
0000000187 00000 n 
0000000246 00000 n 
0000000006 00002 f 
0000000011 00002 f 
0000000374 00000 n 
0000000514 00000 n 
0000000654 00000 n 
0000000794 00000 n 
0000000012 00001 f 
0000000935 00001 f 

trailer
<<
  /Size 13
  /Root 1 0 R
  /ID [ <D85D7BEF6A1EEBB3E02FD2A979A55577> <70E436F9CDEC5B3A834F8822DC29B017> ]
>>
startxref
935
%%EOF

我来逐块分析这个 PDF 文档，并与之前的文档进行比较：

相同：%PDF-1.7 版本，都由 MuPDF 1.27.0 生成

2. 对象定义 (Object Definitions)

对象 2：页面树 (Pages Tree) - 主要变化

pdf 复制代码

2 0 obj
<<
  /Type /Pages
  /Count 5                    ← 页数从 1 变为 5
  /Kids [ 4 0 R 7 0 R 8 0 R 9 0 R 10 0 R ]  ← 引用了5个页面对象
>>
endobj

新增了4个页面对象 (7-10)

除了原有的对象4，新增了：

对象7、8、9、10：都是Page对象
每个都包含 /Rotate 0 属性（旋转角度为0）
对象4没有/Rotate属性，但新增的页面都有

3. 交叉引用表 (Cross-Reference Table)

pdf 复制代码

xref
0 13                          ← 总对象数从9增加到13
0000000005 65535 f 
0000000042 00000 n 
0000000096 00000 n 
0000000187 00000 n 
0000000246 00000 n 
0000000006 00002 f 
0000000011 00002 f 
0000000374 00000 n   ← 对象7
0000000514 00000 n   ← 对象8
0000000654 00000 n   ← 对象9
0000000794 00000 n   ← 对象10
0000000012 00001 f 
0000000935 00001 f

4. 文档尾 (Trailer)

pdf 复制代码

trailer
<<
  /Size 13                     ← 大小从9变为13
  /Root 1 0 R
  /ID [ <D85D7BEF6A1EEBB3E02FD2A979A55577> <70E436F9CDEC5B3A834F8822DC29B017> ]
>>
startxref
935                           ← 交叉引用表起始位置从349变为935
%%EOF

与之前文档的主要区别：

1. 页面数量

之前：1页
现在：5页

2. 对象数量

之前：9个对象（5个在用，4个空闲）
现在：13个对象（11个在用，2个空闲）

3. 页面对象属性

之前：对象4没有/Rotate属性
现在：
- 对象4：无/Rotate（保持原样）
- 对象7-10：都有 /Rotate 0 属性

4. 文件结构

之前：交叉引用表起始位置349，文件较小
现在：交叉引用表起始位置935，文件更大（因为多了4个页面对象）

5. 文档ID不同

两个文档的ID完全不同，说明是不同的文档

6. 修改日期

之前：D:20260201101915+08'00' (10:19:15)
现在：D:20260201101954+08'00' (10:19:54)
相差39秒，可能是对同一文档进行修改操作的时间间隔

推测的可能操作：

这是一个文档扩展操作 - 在原来的1页文档基础上添加了4个空白页面
可能是通过插入页面功能实现的
新增的页面都明确设置了旋转属性（Rotate 0），而原始页面保持原样
保留了原始的对象4（第一页），只是在其后追加了新页面

这个文档仍然是空页面文档（所有页面都没有内容），只是页面数量增加了。

文字图像PDF

cpp 复制代码

%PDF-1.7
%µ¶
% Written by MuPDF 1.27.0

1 0 obj
<<
  /Type /Catalog
  /Pages 2 0 R
>>
endobj

2 0 obj
<<
  /Type /Pages
  /Count 1
  /Kids [ 4 0 R ]
>>
endobj

3 0 obj
<<
  /ModDate (D:20260201103648+08'00')
>>
endobj

4 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /MediaBox [ 0 0 595 842 ]
  /CropBox [ 0 0 595 842 ]
  /Resources <<
    /Font <<
      /AFSF1 7 0 R
    >>
    /ExtGState <<
      /JYE1 16 0 R
    >>
    /XObject <<
      /AFSX1 15 0 R
    >>
  >>
  /Contents 17 0 R
>>
endobj

7 0 obj
<<
  /BaseFont /SIMSAB+SimSun
  /Encoding /Identity-H
  /Subtype /Type0
  /Type /Font
  /DescendantFonts [ 8 0 R ]
  /ToUnicode 13 0 R
>>
endobj

8 0 obj
<<
  /Type /Font
  /Subtype /CIDFontType2
  /BaseFont /SimSun
  /CIDSystemInfo 9 0 R
  /FontDescriptor 10 0 R
  /W 12 0 R
>>
endobj

9 0 obj
<<
  /Registry (Adobe)
  /Ordering (Identity)
  /Supplement 0
>>
endobj

10 0 obj
<<
  /Type /FontDescriptor
  /FontName /SIMSAB+SimSun
  /Flags 32
  /FontBBox [ -7 -140 1000 859 ]
  /ItalicAngle 0
  /Ascent 859
  /Descent -140
  /CapHeight 859
  /StemV 70
  /FontFile2 11 0 R
>>
endobj

11 0 obj
<<
  /Length1 18058290
  /Length 11113
  /Filter [ /ASCIIHexDecode /FlateDecode ]
>>
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我来逐块分析这个 PDF 文档，并与之前的文档进行比较：

相同：%PDF-1.7 版本，都由 MuPDF 1.27.0 生成

2. 对象定义 (Object Definitions)

重大变化：页面数量恢复为1页

pdf 复制代码

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  /Count 1                    ← 页数从5变回1
  /Kids [ 4 0 R ]             ← 只保留对象4作为页面
>>
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页面对象4：现在包含实际内容

pdf 复制代码

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      /JYE1 16 0 R            ← 添加了图形状态
    >>
    /XObject <<
      /AFSX1 15 0 R           ← 添加了图像对象
    >>
  >>
  /Contents 17 0 R            ← 添加了页面内容流
>>
endobj

新增大量对象支持内容显示：

字体对象 (7-13): SimSun 宋体字体
图像对象 (14-15): 84×50 像素的图像
图形状态对象 (16)
页面内容流对象 (17)
更多字体对象 (18-25): 另一组字体定义

3. 详细对象分析

对象7-13：字体系统1

对象7: Type0 字体（SIMSAB+SimSun）
对象8: CIDFontType2 字体描述
对象9: CID系统信息
对象10: 字体描述符
对象11: 字体数据流（压缩的字体文件，18MB原始大小）
对象12: 字符宽度表
对象13: ToUnicode 映射表

对象14-15：图像系统

对象14: 灰度蒙版图像（84×50）
对象15: RGB图像带蒙版（84×50）

对象17：页面内容

包含实际的绘制指令（已压缩）

对象18-25：字体系统2

重复了类似的字体结构，但名称略有不同

4. 交叉引用表 (Cross-Reference Table)

pdf 复制代码

xref
0 28                          ← 对象数量大幅增加到28个
...（省略详细条目）

共28个对象（26个在用，2个空闲）

5. 文档尾 (Trailer)

pdf 复制代码

trailer
<<
  /Size 28                     ← 大小从13变为28
  /Root 1 0 R
  /ID [ <BFF25D4F5B2EBB04E02FD2A979A55577> <2760CAE136EBBD2AA8D2AB702637ABC3> ]
>>
startxref
32533                         ← 交叉引用表起始位置从935剧增到32533
%%EOF

与之前文档的主要区别：

1. 内容变化：从空页面到有内容的页面

之前：5个空页面，无任何资源
现在：1个包含内容的页面，有字体、图像和文本

2. 页面数量减少但内容丰富

之前：5页 → 现在：1页
虽然页面减少，但单页内容丰富

3. 对象数量大幅增加

之前：13个对象 → 现在：28个对象
增加了字体、图像、图形状态等资源对象

4. 文件结构复杂化

包含两个字体子系统（对象7-13和18-25）
包含图像和蒙版系统
包含页面内容流（对象17）

5. 文件大小剧增

之前：交叉引用表在935位置
现在：交叉引用表在32533位置
文件大小增加了约30倍

6. 修改日期变化

之前：D:20260201101954+08'00' (10:19:54)
现在：D:20260201103648+08'00' (10:36:48)
相差16分54秒

7. 页面内容分析

使用了中文字体（SimSun 宋体）
包含84×50像素的图像
页面有实际的绘制内容
可能包含中文字符

8. 文档ID再次变化

与前两个文档都不同

关键特点：

中文支持：包含SimSun字体，表明文档包含中文内容
图像内容：包含一个84×50的图像
真实文档：不再只是框架，而是有实际内容的PDF
资源重用：字体数据被压缩存储（FlateDecode）

这是一个包含中文字体和图像的完整PDF文档，与前两个框架文档有本质区别。

PDF文档结构分析 一

文章目录

一页空白PDF

1. 文件头 (Header)

2. 对象定义 (Object Definitions)

对象 1：文档目录 (Catalog)

对象 2：页面树 (Pages Tree)

对象 3：修改日期

对象 4：页面对象 (Page)

3. 交叉引用表 (Cross-Reference Table)

4. 文档尾 (Trailer)

文档特征总结：

五页空白PDF

1. 文件头 (Header)

2. 对象定义 (Object Definitions)

对象 2：页面树 (Pages Tree) - 主要变化

新增了4个页面对象 (7-10)

3. 交叉引用表 (Cross-Reference Table)

4. 文档尾 (Trailer)

与之前文档的主要区别：

1. 页面数量

2. 对象数量

3. 页面对象属性

4. 文件结构

5. 文档ID不同

6. 修改日期

推测的可能操作：

文字图像PDF

1. 文件头 (Header)

2. 对象定义 (Object Definitions)

重大变化：页面数量恢复为1页

页面对象4：现在包含实际内容

新增大量对象支持内容显示：

3. 详细对象分析

对象7-13：字体系统1

对象14-15：图像系统

对象17：页面内容

对象18-25：字体系统2

4. 交叉引用表 (Cross-Reference Table)

5. 文档尾 (Trailer)

与之前文档的主要区别：

1. 内容变化：从空页面到有内容的页面

2. 页面数量减少但内容丰富

3. 对象数量大幅增加

4. 文件结构复杂化

5. 文件大小剧增

6. 修改日期变化

7. 页面内容分析

8. 文档ID再次变化

关键特点：

PDF文档结构分析一