This indicates an attack attempt to exploit a Denial of Service vulnerability in Adobe Reader.
The vulnerability is caused by an error when the vulnerable software handles a malicious "pdf" file. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system via a crafted "pdf" file.
Adobe Reader 10.1.4
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.