pdftotext

pdftotext is an open source command-line utility for converting PDF files to plain text files.
http://www.foolabs.com/xpdf/download.html
If your machine is x86,Win32,
you can download the Precompiled binaries for Win32,and use pdftotext.exe following pdftotext.txt.
If the PDF you converted contains Simplified Chinese characters,extra Language Support Packages for Chinese/simplified is needed.The URL where you will get the fonts can be founded in file README,which also shows you how to use this pac.

EN写着不顺啊，而且内容还是提及中文问题的。