This indicates an attack attempt against a Sandbox Bypass vulnerability in Adobe Flash Player.
The vulnerability is caused by an error when the vulnerable software handles malicious files. A remote attacker can potentially bypass sandbox on vulnerable systems.
Adobe Flash Player 188.8.131.52 and earlier versions
Adobe Flash Player 184.108.40.2069 and earlier 13.x versions
Adobe Flash Player 220.127.116.115 and earlier versions for Linux
Adobe AIR desktop runtime 18.104.22.1686 and earlier versions
Adobe AIR SDK 22.214.171.1246 and earlier versions
Adobe AIR SDK and Compiler 126.96.36.1996 and earlier versions
Adobe AIR for Android 188.8.131.526 and earlier versions
System Compromise: Remote attacker can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.