This indicates an attempt to exploit a Memory Corruption vulnerability in Adobe Shockwave Player.
This vulnerability is due to insufficient validation on the value of file offset inside an 'rcsL' atom. A remote attacker may be able exploit this to execute arbitrary code within the context of the application or possibly cause a denial of service condition.
Adobe Shockwave Player 126.96.36.199 and earlier
System Compromise: Remote attackers could gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.