The file doesn't contain viruses, the Download Sites are generally trying to get you downloading their downloader software, or pop up some add web pages, that are considered by some tools as "viruses".
But I can confirm the .rar file is safe.
Remember that anti-virus also have "false positive", it happens often and more if it's files with exe headers (auto-unpacking compressed files, etc).
If you don't like the download center medafire, just don't download files from that file hosting web site.
I personally prefer MEGA.NZ, as it's free and fast, as well as doesn't push you adds and downloaders.
Last edited by toysoft; 01-05-2018 at 15:22..