I can say right away that it is difficult (and probably impossible) to embed a virus into the archive itself (its format structure - rar/tar/zip/cab) and infect a computer simply by opening the archive (at least I don't know of any such cases, nor do I know of tools capable of doing this). For a thorough check, I can suggest the following: download the archive (this cannot infect your computer!), unpack it in a "sandbox," then check all the files from the archive and repack it back in the "sandbox" to see how the antivirus reacts. In general, it's a shame that the forum doesn't support the Rar format, as it's a relatively safe format compared to Zip, and the antivirus reacts to it (without reason) much less often, although it supports it on par with other archive formats.