This indicates an attack attempt against a remote denial-of-service 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 cause a denial of service.
Adobe Shockwave Player 22.214.171.1249 and earlier versions
Denial of service
Upgrade to Adobe Shockwave Player 126.96.36.1992: