This indicates an attack attempt to exploit a Buffer Overflow vulnerability in Adobe Photoshop CS6.
The vulnerability results from insecure code in parsing PNG image with a malformed "tRNS" chunk. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted PNG file.
AAdobe Systems Photoshop CS6 13.0
System Compromise: Remote attackers can gain control of vulnerable systems.
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