Use your junk filter. It's a dynamic learning filter so it takes time to learn & viruses take the longest for it to learn about ... but it will eventually learn to filter almost all. Persistence is the name of the game for those types of files!

ie: select the files that are that size in the search results & press the Junk filter button. Keep doing that. I also have my options set to hide junk files. Perhaps you'd prefer to do the same.