cannot filter virus letters

Dmitry <[email protected]>
Newsgroups gmane.mail.bogofilter.general
Message-ID <[email protected]>
Hello!

I get a lot of messages like this:
===============
From: [email protected]
To: [email protected]
Subject: Re: Re: approved
Date: Fri, 23 Jan 2009 17:31:11 +0300
X-Priority: 3
X-MSMail-Priority: Normal

[-- Attachment #1 --]
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Your document is attached.


[-- Attachment #2: application.pif --]
[-- Type: application/octet-stream, Encoding: base64, Size: 39K --]
===============
Spamicity: U 0.502212

After training with the command `bogofilter -s < virus-letter` spamicity is 
still very low to be identified as spam. I repeat training with similar 
letters (different subject, different document name in the attachment), 
but nothing helps to stop this kind of spam.

This is the output of the command `bogofilter -vvv`:

X-Bogosity: Unsure, tests=bogofilter, spamicity=0.519097, version=1.1.5
                                        n    pgood     pbad      fw     U
  "document"                            2  0.021739  0.000065  0.007563 +
  "rcvd:lovepresent.ru"                90  0.500000  0.004387  0.008798 +
  "mime:attachment"                    28  0.065217  0.001637  0.024797 +
  "mime:application"                   20  0.043478  0.001178  0.026829 +
  "mime:Content-Disposition"           33  0.065217  0.001964  0.029501 +
  "head:mixed"                         75  0.065217  0.004714  0.067515 +
  "to:info"                          1164  0.673913  0.074178  0.099163 +
  "head:office-info"            1434  0.739130  0.091659  0.110333 +
  "ip:195"                            193  0.086957  0.012374  0.124610 +
  "mime:base64"                      1074  0.152174  0.069857  0.314632 -
  "head:Date"                       14407  1.000000  0.940225  0.484596 -
  "head:Delivered-To"               15320  1.000000  1.000000  0.500000 -
  "head:lovepresent.ru"             15320  1.000000  1.000000  0.500000 -
  "rcvd:invoked"                    15320  1.000000  1.000000  0.500000 -
  "rcvd:qmail"                      15320  1.000000  1.000000  0.500000 -
  "head:Content-Type"               15296  0.956522  0.998560  0.510751 -
  "to:office.tld"               15201  0.934783  0.992405  0.514950 -
  "head:MIME-Version"               15146  0.847826  0.989066  0.538445 -
  "rcvd:HELO"                       15302  0.826087  0.999345  0.547457 -
  "rcvd:SMTP"                       15302  0.826087  0.999345  0.547457 -
  "rcvd:from"                       15302  0.826087  0.999345  0.547457 -
  "rcvd:network"                    15302  0.826087  0.999345  0.547457 -
  "rcvd:unknown"                    15302  0.826087  0.999345  0.547457 -
  "rcvd:with"                       15302  0.826087  0.999345  0.547457 -
  "message"                          9647  0.434783  0.630287  0.591780 -
  "This"                             9677  0.413043  0.632316  0.604879 -
  "MIME"                             9608  0.347826  0.627995  0.643555 -
  "mime:plain"                      10433  0.369565  0.681943  0.648538 -
  "mime:Content-Transfer-Encoding"   10494  0.369565  0.685937  0.649868 -
  "mime:charset"                    10494  0.369565  0.685937  0.649868 -
  "mime:Content-Type"               10496  0.369565  0.686068  0.649911 -
  "mime:text"                       10497  0.369565  0.686133  0.649933 -
  "head:multipart"                  10839  0.369565  0.708524  0.657203 -
  "format"                           9606  0.326087  0.627930  0.658196 -
  "multi-part"                       9607  0.326087  0.627995  0.658219 -
  "head:X-Priority"                 14064  0.434783  0.919471  0.678950 -
  "head:Normal"                     14019  0.195652  0.917245  0.824195 -
  "head:X-MSMail-Priority"          10745  0.130435  0.703090  0.843514 -
  "rcvd:Jan"                        14800  0.173913  0.968443  0.847759 -
  "from:dfe013-.0"                      1  0.000000  0.000065  0.991605 +
  "mime:application.pif"                1  0.000000  0.000065  0.991605 +
  "rtrn:dfe013-.0"                      1  0.000000  0.000065  0.991605 +
  "subj:approved"                       1  0.000000  0.000065  0.991605 +
  "ip:195.182.154"                      6  0.000000  0.000393  0.998580 +
  "ip:195.182.154.114"                  6  0.000000  0.000393  0.998580 +
  "ip:195.182"                          8  0.000000  0.000524  0.998934 +
  "Your"                                9  0.000000  0.000589  0.999053 +
  "attached"                            9  0.000000  0.000589  0.999053 +
  "mime:Windows-1252"                  10  0.000000  0.000655  0.999147 +
  "mime:octet-stream"                  16  0.000000  0.001048  0.999467 +
  "mime:bit"                          799  0.000000  0.052311  0.999989 +
  N_P_Q_S_s_x_md                       21  0.000000  0.038195  0.519097
                                           0.017800  0.520000  0.375000


-- 
Dmitry
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