This indicates an attack attempt to exploit a Remote Code Execution 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 18.104.22.1687 and earlier versions for Windows and Macintosh
Adobe Flash Player 22.214.171.1242 and earlier 13.x versions
Adobe Flash Player 126.96.36.1998 and earlier versions for Linux
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.