Strange log enteries (bad output - /etc/magic)

[Jostein Elvaker Haande]

Hello,

Recently I've seen my logs fill up with the following enteries:

---------<8--------------
616492 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 211:
Warning: string exten
       sion `B' invalid
616493 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 321:
Warning: string exten       sion `B' invalid
616494 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 322:
Warning: string exten       sion `B' invalid
616495 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 443:
Warning: string exten       sion `B' invalid
616496 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 675:
Warning: string exten       sion `B' invalid
616497 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 680:
Warning: string exten       sion `B' invalid
616498 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 684:
Warning: string exten       sion `B' invalid
616499 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 685:
Warning: string exten       sion `B' invalid
616500 Mar 31 17:41:01 tellus amavis[10539]: (10539-05) (!)NOTICE:
Skipping bad output from file(1) at [0, p001], got: /etc/magic, 686:
Warning: string exten       sion `B' invalid
-----------<8-----------

I'm running amavisd-new-2.6.4 (20090625) under Debian 6.0.1 with the
«squeeze-updates» repo for the new amavis/spamassissin packages. Now,
amavis works, but with the volume of mails I receive on the server in
queestion, the above output clogs up the logs quite badly.

Now what does the above mean? Is it attachments to mails that are
malformed, or is the file /etc/magic that f00bar or something else?

Pointers would be *greatly* appreciated!

-- 
Yours sincerely Jostein Elvaker Haande
"A free society is a place where it is safe to be unpopular"
- Adlai Stevenson

http://tolecnal.net -- tolecnal at tolecnal dot net