A clickable picture should trigger a web client only if the pdf contains a 
script for this action, which you can detect using clamav.

-------- Original Message --------
On Jun 4, 2021, 08:19, Benoît Panizzon < benoit.paniz...@imp.ch> wrote:
Hi Gang
In the last couple of weeks, I have seen a lot of spam mails containing
just one single PDF, hardly any other text. That PDF again contains a
clickable picture leading to some phishing site or similar.
Of course the URL in the PDF is not being checked against URI
Blacklists.
Also creating a rule to match PDF attachment and little text would
create way too many false positives, as sending 'PDF Emails' seems to
be something quite common.
So I wonder if someone already came up with a AS plugin to extract
links from a PDF and check them against URI blacklists.
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
--
I m p r o W a r e A G - Leiter Commerce Kunden
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