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.
Adobe Flash Player Desktop Runtime 188.8.131.52 and earlier on Windows, and Linux
Adobe Flash Player Desktop Runtime 184.108.40.206 and earlier on Macintosh
Adobe Flash Player for Google Chrome 220.127.116.11 and earlier on Windows, Macintosh, Linux and Chrome OS
Adobe Flash Player for Microsoft Edge and Internet Explorer 11 18.104.22.168 and earlier on Windows 10 and 8.1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.