You have submitted a suspicious file or email to Symantec for Analysis. The reply describes the message or one of its attachments as “not malicious itself, but may be an artifact of a threat. What exactly does this mean?
"Threat Artifact" means that the email or file in question is not capable of performing any harm by itself, and so does not meet Symantec's criteria for malware detection. The file may, however, indicate that a threat was present on the computer or that an attack was made against the computer.
Please note that a verdict of "ThreatArtifact" does not mean that the email or the file is harmless; it may mean that the email or one of its attachments contains a link to a malicious download hosted on a website.
For Symantec Cloud Email Security:
Email artifacts are aggregated and provided to Symantec .cloud AntiSpam team for analysis and possible filter creation. See also Spam email missed (False Negative) in Symantec.cloud for additional information.
For Symantec Messaging Gateway (SMG) and Symantec Mail Security for MS Exchange (SMSMSE):
Please submit email messages that generate a "Threat Artifact" response using the following processes: Manually submitting missed spam, phishing, marketing, suspicious URLS
Some examples of Threat Artifacts: