I have no problem with dbus's pid or socket files!
What's happen, if you try the command-line scanner:
/usr/lib/avast4workstation/bin/avast /var/run/dbus
culpeper@linux:~> avast /var/run/dbus
/var/run/dbus/pid [OK]
/var/run/dbus/system_bus_socket [scan error: No such device or address]
#
# Statistics:
#
# scanned files: 2
# scanned directories: 1
# infected files: 0
# total file size: 5.0 B
# virus database: 0601-3 06.01.2006
# test elapsed: 0s 1ms
#
culpeper@linux:~>
===========================
culpeper@linux:~> su -
Password:
linux:~ # avast /var/run/dbus
/var/run/dbus/pid [OK]
/var/run/dbus/system_bus_socket [scan error: No such device or address]
#
# Statistics:
#
# scanned files: 2
# scanned directories: 1
# infected files: 0
# total file size: 5.0 B
# virus database: 0551-4 22.12.2005
# test elapsed: 0s 1ms
#
linux:~ #