How to remove the pdf:urlmal-inf[trj] virus?

  To remove the pdf:urlmal-inf[trj] virus -

The detection of PDF.UrlMal-inf [Trj] virus is related to the Content of the PDF. The file itself isn't harmful, but it does contain links to sites that have been found harmful. That's why an empty file can never be infected with a PDF.UrlMal-inf. Check these:

Search your .docx file for hyperlinks.
Test these URLs with e.g. VirusTotal.

Manually remove the links that have been found malicious.

  Convert the PDF again.

To neutralise the file, an AV would be required to create working PDF files.

  What is pdf:urlmal-inf Virus?

PDF/UrlMal.INF! tris categorised as a trojan. It is a type of Malware that performs activities without the knowledge of the user. Such activities commonly include capturing keyboard input, establishing remote access connection, collecting system information, dropping other malware into other infected systems, running/terminating processes, downloading/uploading files, etc. It is recommended that your FortiGate/FortiClient system is using the latest AV database. Make sure that Quarantine/delete files that are detected and replace infected files with clean backup copies.