This indicates an attack attempt to exploit a Memory Corruption 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 Systems AIR 188.8.131.52 and earlier
Adobe Systems Flash Player 184.108.40.2060 and earlier
Adobe Systems Flash Player 220.127.116.11 and earlier
Adobe Systems Flash Player 18.104.22.168 and earlier
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.