/etc/logrotate.d/clamav-update

/var/log/freshclam.log {
        monthly
        notifempty
}
====================================================
/etc/logrotate.d/clamav

/var/log/clamd.log {
    missingok
    create 640 clamav clamav
    postrotate
        /bin/kill -HUP `cat /var/run/clamav/clamd.pid 2> /dev/null` 2> /dev/null || true
    endscript
}

/var/log/freshclam.log {
    missingok
    create 640 clamav clamav
    postrotate
        /bin/kill -HUP `cat /var/run/clamav/freshclam.pid 2> /dev/null` 2> /dev/null || true
    endscript
}