Sometimes when you open a PDF Adobe Reader prompts you to accept the EULA and then closes.
Just open the Adobe Reader once WITHOUT any file and accept the EULA.
Another weird thing is, when the path to your file (or the file itself) contain the String ‘CR’. (Carriage Return, assuming).
For example \scrserver1.childomain.domain.tldsharefile.pdf or \serversharecricket.pdf
If this happens more often in your domain just roll out the following registry entry
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINESOFTWAREAdobeAdobe Acrobat10.0AdobeViewer] "EULAAcceptedForBrowser"=dword:00000001
Download (rename to .reg)