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While trying to make sure I have no threats on my iMac I used Bitdefender to perform a full scan and I found this

Output of running ls -la in /dev/fd:

 ls -la
total 11
dr-xr-xr-x 1 root wheel 0 Nov 25 16:43 .
dr-xr-xr-x 3 root wheel 5426 Nov 25 16:43 ..
crw---w--- 1 ahmedyounes tty 16, 1 Nov 26 03:42 0
crw---w--- 1 ahmedyounes tty 16, 1 Nov 26 03:42 1
crw---w--- 1 ahmedyounes tty 16, 1 Nov 26 03:42 2
dr--r--r-- 1 root wheel 0 Nov 25 16:43 3
dr--r--r-- 1 root wheel 0 Nov 25 16:43 4
dr--r--r-- 1 root wheel 0 Nov 25 16:43 5

How can I clear this threat even its just .exe keygen?
What it may be the source of this threat?

Update after solving it thanks to Scott , duskwuff and JigglyNaga

it was strange that I couldn't delete it from my iMac until I went to Gmail from the website and found it.

1. 
   

   I wouldn't say that this should be disregarded,
   but I agree with duskwuff that
   the presentation of the message is nonsense. 
   And I agree that, even if Bitdefender found something in /dev/fd/9,
   it was specific and localized to a process that was running at that instant,
   and you won't find anything in /dev/fd now. 
   I suggest that you

   
   
   
   • research "Salfeld.Child.Control", "BRDBRDkeygenKeygen.exe",
     and other strings from the messages, and
   
   
   • get another anti-virus product.
   
   



2. The Bitdefender screen talks about "messages" and "Subject" lines. 
   Do you have email on your system? 
   Is there a message with Subject "child control"? 
   The problem might be there. 
   Be careful; if the message has attachments, do not open them.



3. Your question title is wrong;
   there's nothing in your question about "tty". 
   The problem was reported in fd 9;
   the only ttys in your questions are file descriptors 0, 1 and 2.

This result is nonsense, and should be disregarded. There is something seriously wrong with this antivirus software.

The objects in /dev/fd on macOS are not files -- they represent the file descriptors which the current process has open. It makes no sense to "scan" a file descriptor for viruses, and makes even less sense to attempt to "quarantine" one.

You downloaded your email archive, and the virus scanner scanned it and found malware inside some attachments.

Two emails had an attachment named Salfeld.Child.Control.2008.v9.975.0.0.rar, and inside that Rar archive there was a file named "Keygen.exe". The full directory name Salfeld.Child.Control.2008.v9.975.0.0.WinALL.Incl.Keygen-BRD suggests that this archive contained both Salfeld's "Child Control" product, and a key generator for it; the virus scanner believes that the "keygen" executable is actually malicious.

Now, for one reason or another, the virus scanner wasn't able to show you an absolute path to the file(s) in which it found a detection. This may have been because it was scanning the emails mid-download, before saving to disk; or it may have been because it was scanning an archive containing 10 years' worth of emails, and needed to (temporarily) extract them somewhere.

Either way, its fallback was to report the meaningless /dev/fd/<number> (which was only a valid file handle for the scanner process), followed by some more helpful details: email subject and date, the attachment name, and the filename within the Rar archive.

If you were to find that email, save the ".rar" attachment to disk and rescan it, or even extract the Rar and scan "keygen.exe" on its own, I expect you would see the same result: "Worm.generic.269236". If you don't understand what's happening here, I strongly recommend that you don't extract the archive, even on a Mac. Instead, if you have any doubts about this detection being correct (eg. you think the file really is a key generator and nothing more), you should contact the antivirus support directly.

(Full disclosure: I work for another antivirus company.)