Exporting/Saving Renderable Text from PDF to text file

Using my computer with Acrobat 9 Pro, with individual files I have tried to save the PDF file as a text file and I have also tried to export the file to a text file format. In both cases none of the OCR text was captured in the text file. Each PDF has a form field with a bates number on the first page. The only text exported to the text file was the text within the form field. I also tried with my Acrobat XI Standard and that also exported only the form field data to the text file. I know text exists within the PDF files because I can select the text, copy it and paste it into another document like a wordpad file. When I try to OCR the document, the software won’t run text recognition because there is already renderable text on each page. Somehow, the PDF was created to include the text in the PDF file, but I can’t seem to be able to extract the text. I spoke to the vendor that created the files and they are able to use their software to extract the text from each PDF file. I’m happy to have the problem resolved in the short term, but am frustrated that some software systems appear to create PDF files that won’t allow text to be extracted using Save As or Export.