Sophos PureMessage Scanner service (PMScanner.exe) in PureMessage for Microsoft Exchange 3.0 before 3.0.2 allows remote attackers to cause a denial of service (message queue delay and incomplete spam rule update) via a crafted (1) RTF or (2) PDF file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44775
http://www.sophos.com/support/knowledgebase/article/44385.html