This indicates an attack attempt to exploit an Integer Overflow vulnerability in Adobe Flash Player.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted SWF file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted SWF file.
Adobe Flash Player 126.96.36.199 and earlier versions
Adobe Flash Player 188.8.131.521 and earlier 13.x versions
Adobe Flash Player 184.108.40.2067 and earlier 11.x versions
AIR Desktop Runtime 220.127.116.11 and earlier versions
AIR SDK and SDK & Compiler 18.104.22.168 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable system.
Apply the latest update from the vendor.