Bloodhound.ST.1 is a heuristic detection for incoming email attachments that have a low reputation score based on analyzing data from Symantec's community of users and are therefore likely to be security risks.
Symantec’s reputation-based security engine continuously monitors all files and over time a file's reputation may change.
Files that are detected as Bloodhound.ST.1 may be malicious. We suggest that you submit any such files to Symantec Security Response. For instructions on how to do this using Scan and Deliver, read Submit Virus Samples
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":