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 22.214.171.1249 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to Adobe Shockwave Player 126.96.36.1992: