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.
Flash Player 11.4.402.278 and earlier versions for Windows
Flash Player 11.4.402.265 and earlier versions for Macintosh
Flash Player 126.96.36.199 and earlier for Linux
Flash Player 188.8.131.52 and earlier for Android 4.x
Flash Player 184.108.40.206 and earlier for Android 3.x and 2.x
Flash Player 220.127.116.111 and earlier for Chrome users (Windows and Linux)
Flash Player 11.4.402.265 and earlier for Chrome users (Macintosh)
Flash Player 11.3.374.7 and earlier in Internet Explorer 10
AIR 18.104.22.1680 and earlier for Windows and Macintosh
AIR 22.214.171.1240 SDK (includes AIR for iOS) and earlier
AIR 126.96.36.1990 and earlier for Android
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.