This indicates an attack attempt to exploit a Heap 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 11.7.700.232 and earlier versions for Windows and Macintosh
Adobe Flash Player 11.8.800.94 and earlier versions for Windows and Macintosh
Adobe Flash Player 184.108.40.2067 and earlier versions for Linux
Adobe Flash Player 220.127.116.11 and earlier versions for Android 4.x
Adobe Flash Player 18.104.22.168 and earlier versions for Android 3.x and 2.x
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.