PDF

Converting PDF to Text in C#
http://www.codeproject.com/Articles/12445/Converting-PDF-to-Text-in-C
PDF File Analyzer With C# Parsing Classes
http://www.codeproject.com/Articles/450254/PDF-File-Analyzer-With-Csharp-Parsing-Classes

PDF文件格式分析
http://www.2cto.com/Article/201011/77380.html