This indicates an attack attempt to exploit an Use After Free 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 Flash Player Desktop Runtime 184.108.40.206 and earlier on Windows and Macintosh
Adobe Flash Player Extended Support Release 220.127.116.116 and earlier on Windows and Macintosh
Adobe Flash Player for Google Chrome 18.104.22.168 and earlier on Windows, Macintosh and Linux
Adobe Flash Player for Internet Explorer 10 and Internet Explorer 11 22.214.171.124 and earlier on Windows 8.0 and 8.1
Adobe Flash Player 126.96.36.1998 and earlier on Linux
AIR Desktop Runtime 188.8.131.52 and earlier on Windows and Macintosh
AIR SDK 184.108.40.206 and earlier on Windows, Macintosh, Android and iOS
AIR SDK & Compiler 220.127.116.11 and earlier on Windows, Macintosh, Android and iOS
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.