We employ "Clam An-Virus" software on the servers that deliver the intelligentcontract service. This is a vital service that ensures we do not import and then inadvertently distribute virus software. 

Each time you upload attachments to the intelligentcontract service, the document will be scanned by the anti-virus software and will be rejected if the software detects any virus or malware. 

If you do get this message, it is likely the attachment you are attempting to upload is infected and you should discard the file.