This indicates an attack attempt to exploit a remote code-execution vulnerability in Adobe Shockwave Player.
The vulnerability is caused by an error when the vulnerable software handles a "DIR" file that includes an overly large integer value field. It can be exploited via a crafted ".dir" file, leading to remote code execution.
Shockwave Player 126.96.36.1992 and earlier versions for Windows and Macintosh
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's web site for suggested workaround.