OK, so what you're seeing is, indeed an open Evernote .dmg.

If you go to /Applications/Utilities/Disk Utility.app while it's open and click on the .dmg itself you'll see the path to where it lives down below, (Edit:) and you can delete it and see what happens.

Last edited by artie505; 01/27/15 01:06 AM.
The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire