Malicious files often use names like Zippyshare.com - 1 (2).mp4.exe . If your computer is set to "hide extensions for known file types," you will only see the .mp4 part. Clicking this runs an executable program (malware) instead of playing a video.
Today, seeing this file name is often a red flag for several reasons. Why You See This File Name Zippyshare.com - 1 (2).mp4