This indicates an attack attempt to exploit a Memory Corruption vulnerability in Adobe Reader and Acrobat.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted PDF file with an embedded malformed TrueType Font. A remote attacker may be able to exploit this to cause a denial of service of the application or a potential arbitrary code execution.
Adobe Reader X (10.1.3) and earlier 10.x versions for Windows and Macintosh
Adobe Reader 9.5.1 and earlier 9.x versions for Windows and Macintosh
Adobe Acrobat X (10.1.3) and earlier 10.x versions for Windows and Macintosh
Adobe Acrobat 9.5.1 and earlier 9.x versions for Windows and Macintosh
System Compromise: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.