This indicates an attack attempt against a remote code execution vulnerability in Adobe Shockwave Player.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted ".dir" file. It allows a remote attacker to execute arbitrary code.
Adobe Shockwave Player 188.8.131.529 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Update to Adobe Shockwave Player 184.108.40.2062: