Description of problem:

Fresh install of clamav-0.98.4-1.el6.x86_64:

# freshclam
ClamAV update process started at Mon Oct 20 16:33:58 2014
main.cvd is up to date (version: 55, sigs: 2424225, f-level: 60, builder: neo)
WARNING: Can't get information about db.# tz zone descriptions (deprecated version).clamav.net: Name or service not known
...

# grep -F DatabaseMirror /etc/freshclam.conf
#DatabaseMirror db.XY.clamav.net
DatabaseMirror db.# tz zone descriptions (deprecated version).clamav.net
DatabaseMirror db.local.clamav.net

%post has:

ZONES="/usr/share/zoneinfo/zone.tab"
CONFIG="/etc/sysconfig/clock"

if [ -r "$CONFIG" -a -r "$ZONES" ]; then
        source "$CONFIG"
        export CODE="$(grep -E "\b$ZONE\b" "$ZONES" | head -1 | cut -f1 | tr [A-Z] [a-z])"
fi

if [ -z "$CODE" ]; then
        export CODE="local"
fi

/usr/bin/perl -pi -e '
                s|^(DatabaseMirror) database\.clamav\.net$|$1 db.$ENV{"CODE"}.clamav.net\n$1 db.local.clamav.net|;
                s|^(DatabaseMirror) db\.\.clamav\.net$|$1 db.$ENV{"CODE"}.clamav.net\n$1 db.local.clamav.net|;
        ' /etc/freshclam.conf{,.rpmnew} &>/dev/null || :

which is not present in the Fedora package.