This indicates an attack attempt against a buffer-overflow vulnerability in ACDSee.
The vulnerability is caused by an error when the vulnerable software handles a malicious .tiff file. It allows a remote attacker to execute arbitrary code via sending a crafted .tiff file.
ACDSee Photo Manager 10.x
ACDSee Photo Manager 2009 11.x
ACDSee Pro 2 Photo Manager 2.x
System Compromise: Remote attackers can gain control of vulnerable systems.
Do not open untrusted .tiff files.