The fact that a file has two or more extensions, doesn't automatically mean it is malware. There are many legitimate instances where a file will have multiple . (periods) in it but they aren't necessarily file extensions.
However, in this case avast 'does alert' on this file (see image, click to expand) with the latest avast virus definitions, 120419-0. This is a web shield alert when trying to download of your file sharing site link.
Please remove the file sharing link as you have no control over who might download it or what they may do with it.