I think it might be a false positive. Try checking with rkhunter, because it gives fewer false positives. To download rkhunter, and for more detailed info on how to use it, See this site

If it come up clean, then you have reason for concern.

Try this as well:

1. rkhunter --check




2. update




3. sudo rkhunter --propupd




4. rkhunter --check

^{Source: The Rootkit Hunter project}