Yes. Like all other virus scanners, they maintain a database of virus signatures which they use to detect viruses. 

Assuming the virus is in the Clam db, it will be detected. 

> On Feb 8, 2014, at 18:26, paul g <pj.world at hotmail.com> wrote:
> 
> I would like to ask about the ClamAV antivirus scanner. Is the ClamAV really capable of detecting a trojan etc within an .exe file? Thank you for links and any help.
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