File Type SupportBrowser Info Environment
You should first check out pdf files with the original list files from set addon these templates supplement.
Then try creating a new template based on one of these, but change the code to include pdf files with the file types shown.
Beware that doing so could result in complete pdf files being served to a browser, so it could make the list a massive page to render, even if the browser is capable of showing them in thumbnails. Even then, the result could be browser dependant.