This indicates an attack attempt to exploit a remote Code Execution vulnerability in Adobe Flash Player.
The vulnerability is due to insufficient validation when handling crafted SWF files. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage containing a crafted SWF file and execute arbitrary code within the context of the application.
Adobe Flash Player 11.6.602.168 and earlier versions for Windows
Adobe Flash Player 11.6.602.167 and earlier versions for Macintosh
Adobe Flash Player 126.96.36.1990 and earlier versions for Linux
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.