This indicates an attack attempt against an Information Disclosure vulnerability in Adobe Flash Player.
The vulnerability is caused by an error when the vulnerable software handles maliciously crafted SWF files. A remote attacker can exploit this to gain unauthorized access to sensitive information.
Adobe Flash Player 22.214.171.124 and earlier versions
Adobe Flash Player 126.96.36.1999 and earlier 13.x versions
Adobe Flash Player 188.8.131.525 and earlier versions for Linux
Adobe AIR desktop runtime 184.108.40.2066 and earlier versions
Adobe AIR SDK 220.127.116.116 and earlier versions
Adobe AIR SDK and Compiler 18.104.22.1686 and earlier versions
Adobe AIR for Android 22.214.171.1246 and earlier versions
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.