Linux malware detection tools
chkrootkit (malware scanner)
chkrootkit is a malware scanner to locally check for signs of a rootkit. It is written in shell script and runs on the host system itself.
LMD (malware detection tool)
Linux Malware Detect (LMD) is a malware scanner for systems running Linux. The open source software project is released with the GPLv2 license.
mime2vt (test MIME attachments against VirusTotal)
Rootkit Hunter (malware scanner)
Security tool to search for traces of rootkits, backdoors, and other malicious components on systems running Linux and other flavors of Unix