On my Windows 8.1 computer I created an MS Word document containing a couple images I downloaded from the internet, and exported it as PDF. The MS Word version is 14.0.7232.5000, 64 bit. I sent that PDF to a number of recipients by email.

One email bounced with the line

MTP error from remote server for TEXT command, host: mailin.snafu.de ( reason: 550 This message contains malware (Win.Exploit.CVE_2019_0903-6966169-0)

None of the other mails containing the same attachment bounced. When I scanned the attachment with virustotal.com just one of the 58 engines reported a detection, ClamAV. The detection was labeled exactly "Win.Exploit.CVE_2019_0903-6966169-0" (which may indicate that the provider uses ClamAV). On the details page one property of the file was marked as suspicious, "Contains at least one embedded file".

CVE-2019-0903 is a buffer overflow in the Windows GDI.

Question: Is this a false positive? If not, why do other engines not detect it, even though it has been public since May 15 and the CVE entry is from November 2018?


It seems like a false-positive; from marc.info clamav:

Our system updated today:

May 25 09:24:20 daily.cld updated (version: 25460, sigs: 1581004, f-level: 
63, builder: raynman)

(Time is BST - i.e. UTC+1)

After that we saw a large number of viruses found - all detected as Win.Exploit.CVE_2019_0903-6966169-0

This seems to be including mails without any attachments.

  • 1
    False-positive is very likely. Yesterday's ClamAV signatures gave me a false positive and caused some scans to fail with "Segmentation Fault 11". It reported Win.Exploit.CVE_2019_0903-6966169-0 FOUND in a PDF, and Virus Total reported the same from ClamAV, the only detection report. Both local scan issues are resolved in today's update daily-25462.cdiff, and Virus Total shows the file as clean. – Jonathan Dagle May 27 at 13:32

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