Please, don't do this. Attaching files that avast! announces as infected is really not a good idea!
I don't know what makes you think that the file is clean. The file, though named .exe.jpg, is an executable file in fact. When started, it checks for a presence of a known AdWare (TMKSoft XPlugin), tries to download a file from a strange IP address, write it to system directory and start it (including possible planning to be started on next restart).
It really doesn't look like an innocent piece of code.