PDFBox Is Throwing Exception in extraction in case of few pdf in .NET 3.5

i am using the pdfbox libraries in C# with Framework 3.5.

my code is :-

PDDocument doc = PDDocument.load("pdf file path");
PDFTextStripper stripper = new PDFTextStripper();
Result = stripper.getText(doc);

this code is running and working fine. but in case of few pdf(specially when it has images)
It was giving the error of missing assembly bcprov-jdk14-132. i add the reference of this assembly.
now it is again giving the following error on the third line of fetching text.

<b>The type initializer for 'gnu.java.util.regex.RESyntax' threw an exception.</b>

Please solve the problem. it is very urgent.

I have also attached the pdf which is giving error in extracting the text

thanks in advance