Why am I seeing this in /var/log?

I've noticed a lot of weird logs in /var/log on my server.

For example:

cd /var/log/DIST00000001ARGC00000005ARGV00000002ccARGV00000002-cARGV00000006nmap.cARGV00000002-oARGV00000006nmap.oDOTI00000000sudo cat user.log Jun 30 16:48:08 DIST00000001ARGC00000005ARGV00000002ccARGV00000002-cARGV00000006nmap.cARGV00000002-oARGV00000006nmap.oDOTI00000000

Another example:

cd /var/log/Nmapsudo cat user.log Jun 30 16:48:28 Nmap

Note Nmap is not installed on my server.

Another example:

cd get_infosudo cat user.logJun 30 16:48:25 get_info

I'm worried this may be a sign my server has been compromised, but perhaps it's something else?

The server is Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-77-generic x86_64) with unattended-upgrades turned on for security updates.