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Bad Download: Blame it to the internet connection that halted the complete downloading of the PDF files on your system. It's the most basic reasons behind the PDF file corruption. To download properly, make sure the internet doesn't disconnect in between. If it does then reconnect and try again, also many times when download is halted you may actually get a pdf file downloaded incompletely. These improper download files generally refuse to open.
Bad Creation of the PDF file: Aren't there too many tools to create a PDF file. Some might be genuine but others are total time waste. And when user creates a PDF file using a bad pdf creator tool then after downloading it on the desktop it may got corrupt. Also it may not be compatible with the pdf tool which you use.
Sudden Shutdown: A sudden shutdown of the system also becomes the cause if a PDF corruption opened at the time of shut-down.
Virus Threats: PDFs are vulnerable to threats from viruses & malwares. They may easily be corrupted by these threats. Updated anti-virus software will ensure even newly created viruses intruding your system.
Please list some more causes of PDF corruption & solutions if any. You may also list freeware, shareware tools which repair corrupted PDF files.
