This indicates an attack attempt to exploit a Remote Code Execution vulnerability in Adobe Shockwave Player.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted "dir" file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted "dir" file.
Shockwave Player 18.104.22.1684 and earlier versions for Windows and Macintosh
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to the latest version available from the website.