Adobe profession 9.0 Version of PDF documents not supported by PDFBox0.7.3

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Which version of the PDF documents are supported by PDFbox0.7.3, As we upload a document of version Adobe Professional writer 9.0 and while creating the difference files to compare, we will extract the text data from the PDF document using the class PDFTextStripper.class method getText().
String PDF_text = new String();
PDFTextStripper stripper = new PDFTextStripper();
PDF_text = stripper.getText(document);
But it will return null if the argument as document is created from adobe Professional 9.0 else it will run successfully.
Please help or at least let us know if any upcoming new version PDFBox does support this.