EICAR

# EICAR Test
cat > samplevirus.txt <<"EOF"
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
EOF
#/opt/clamav/bin/clamscan samplevirus.txt
clamscan samplevirus.txt
rm samplevirus.txt

https://en.wikipedia.org/wiki/EICAR_test_file

"The EICAR Anti-Virus Test File or EICAR test file is a computer file that was developed by the European Institute for Computer Antivirus Research (EICAR) and Computer Antivirus Research Organization (CARO) to test the response of computer antivirus (AV) programs. Instead of using real malware, which could cause real damage, this test file allows people to test anti-virus software without having to use a real computer virus."

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

MD5	44d88612fea8a8f36de82e1278abb02f
SHA256	275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f