system
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junction.exe is no malware anyway. IIRC that’s an MS (sysinternals) program that brings junction points (aka sym links) support when it’s not there out of the box, i.e. on XP.
As to why the OP uses it, the answer is simple, Dropbox doesn’t allow the syncing of any folder in Windows: all dropbox synced files reside in one chosen folder (with subfolders etc…). So the trick to sync external folders is to use… sym links.
… edit: and yeah, he shouldn’t have allowed avast sandbox to take care of the process, must have generated a huge mess.