This indicates an attempt to exploit a Code Execution vulnerability in Adobe Shockwave Player.
This vulnerability is due to an error that occurs when the vulnerable software handles a malformed .DIR file. An attacker may exploit this to execute arbitrary code via a crafted .DIR file.
Adobe Shockwave player 188.8.131.527 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's advisory for updates: