This indicates an attack attempt to exploit a Denial of Service vulnerability in GFI Faxmaker.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted fax document which can be either .fax, .tiff or any supported facsimile documents. As a result, a remote attack may be able to exploit this to cause a denial of service condition on the application.
GFI Faxmaker 10.0 Build 237
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.