I can stop the daemon according to your instructions, but then follow some other error/PANIC:
jari@jari-PC:~$ /etc/init.d/clamav-freshclam stop
[ ok ] Stopping clamav-freshclam (via systemctl): clamav-freshclam.service.
jari@jari-PC:~$ freshclam
ERROR: Can't open /var/log/clamav/freshclam.log in append mode (check permissions!).
ERROR: Problem with internal logger (UpdateLogFile = /var/log/clamav/freshclam.log).
jari@jari-PC:~$ sudo freshclam
[sudo] password for jari:
Sun Aug 4 17:50:10 2019 -> ClamAV update process started at Sun Aug 4 17:50:10 2019
Sun Aug 4 17:50:10 2019 -> ^Your ClamAV installation is OUTDATED!
Sun Aug 4 17:50:10 2019 -> ^Local version: 0.100.3 Recommended version: 0.101.2
Sun Aug 4 17:50:10 2019 -> DON'T PANIC! Read
https://www.clamav.net/documents/upgrading-clamavSun Aug 4 17:50:10 2019 -> main.cvd is up to date (version: 58, sigs: 4566249, f-level: 60, builder: sigmgr)
Sun Aug 4 17:50:10 2019 -> daily.cld is up to date (version: 25531, sigs: 1699730, f-level: 63, builder: raynman)
Sun Aug 4 17:50:10 2019 -> bytecode.cld is up to date (version: 330, sigs: 94, f-level: 63, builder: neo)
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Jari