Perhaps this authoritative source will also help you.
I have two PDF files that are reporting as corrupt in the most current version of reader. The owner of the file is generally clueless as well but the timestamps are from November 2009. But I have no idea what's in these files aside from text. It may be mixed text/images or the result of a scan with OCR applied. I'm going to try some of the third party readers (like Foxit) to see if I have any better luck but while I'm downloading and installing those, does anyone have a suggestion or a tool that has had better than average results?