That's the crash log:
Process: AdobeAcrobat [628]
Path: /Applications/Adobe Acrobat XI Pro/Adobe Acrobat Pro.app/Contents/MacOS/AdobeAcrobat
Identifier: com.adobe.Acrobat.Pro
Version: 11.0.09 (11.0.09)
Code Type: X86 (Native)
Parent Process: ??? [1]
Responsible: AdobeAcrobat [628]
User ID: 502
Date/Time: 2014-10-31 12:25:41.079 +0100
OS Version: Mac OS X 10.10 (14A389)
Report Version: 11
Anonymous UUID: 43AD1508-5295-53D7-0EEE-D7F5F3F00301
Sleep/Wake UUID: 5EB24A70-D9C7-49B5-8067-12E683564080
Time Awake Since Boot: 7800 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
The PDFs are opened from the desktop, there is no URL in it.