Sometimes different solutions may help you, if not; see resources below where you find more variants of restoration .pdf documents...
PDF Open File Tool
How to overcome your issue see below:
< Navigate to the location with the corrupted PDF file. Right-click on it and select "Rename." Type any other file name and hit "Enter." Sometimes, a simple rename can troubleshoot corrupt PDFs.
< Make sure your Adobe Reader is in working condition. Open any other PDF files on your hard drive to make sure the problem is not originating from your Adobe Reader. If it does, reinstall Reader from Adobe's website.
< Update Adobe Reader. Launch Adobe Reader from the Start menu under "All Programs." Click on the "Help" tab and select "Check for Updates..." Follow the on-screen prompts to complete installing the updates. Try re-opening the PDF file.