spamassassin and one-image-spam filtering

[Lawless]

Hi,

I'm using a years old bayes db which has learned ten thousands of spams and which provides really good filterting.
But in the last few weeks and months there are more and more of these I-put-all-my-content-on-one-image spams - and SA does not filter one of them because it's just an image...

So I'm asking you how I can tell SA to filter mails with only one image as an attachment and no other text in the body... is SA capable of doing this or is it a text only filter?
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Kernel panic: I have no root and I want to scream

[Lawless]

Hmhm.... just saw that SA was limited to a very small filesize - I'll try it with a higher value to see if it will filter now...
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Kernel panic: I have no root and I want to scream