This indicates an attack attempt to exploit a Security Bypass 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 bypass the same origin policy of Adobe Flash.
Adobe Flash Player Desktop Runtime 126.96.36.199 and earlier Windows and Macintosh
Adobe Flash Player Extended Support Release 188.8.131.52 and earlier Windows and Macintosh
Adobe Flash Player for Google Chrome 184.108.40.206 and earlier Windows, Macintosh, Linux and ChromeOS
Adobe Flash Player for Microsoft Edge and Internet Explorer 11 220.127.116.11 and earlier Windows 10
Adobe Flash Player for Internet Explorer 10 and 11 18.104.22.168 and earlier Windows 8.0 and 8.1
Adobe Flash Player for Linux 22.214.171.1248 and earlier Linux
AIR Desktop Runtime 126.96.36.199 and earlier Windows and Macintosh
AIR SDK 188.8.131.52 and earlier Windows, Macintosh, Android and iOS
AIR SDK & Compiler 184.108.40.206 and earlier Windows, Macintosh, Android and iOS
AIR for Android 220.127.116.11 and earlier Android
Security Bypass: Remote attackers can bypass security checks of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.