I found this 3-Heights PDF Desktop Repair Tool the other day when I was looking for the tools to repair one of my PDF fillable form document that always pops up the warning saying unable to extract the embedded fonts from the document when you open it. It sounds easy to fix but I just couldn't find a way in either Acrobat Standard or Profession edition. This tool did fix the problem by just couple of simply clicks, works quite amazing.
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3-Heights™ PDF Desktop Analysis & Repair Tool has a graphical user interface and allows you to analyze PDF files against the PDF Specification. Corrupt files are either repaired, or intact embedded images (including scanned pages) can be recovered if the file is irreparable.
download the evaluation version from here
The evaluation provides you the full features without time limitation except leaving a watermark on a repaired copy of PDF file. However, I discovered that this cross-page watermark can be easily removed in Acrobat Standard edition but would be very time-consuming if the PDF file contains hundreds of pages because you have to manually remove it from every single page.