How to extract an Apache FOP created PDF in C#?

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Hi!

I have a problem in my c# project.
I want to extract Apache FOP generated PDF files programatically without any 3rd party application.
I tried to use many libary like PDFBox, IKVM, PDF2Text, ITextSharp, PDFSharp to extract PDF files, but failed.
When i extract a FOP generated PDF to a text file, i get a lots of square symbols and other entangled characters.

My question is, how can i extract a FOP generated PDF file in C#?
Is there any library (written to C#), which can do that?

Thanks.