Strange disk showing in Disk Utility

After doing several updates recently on my MacBook Air, decided to run a Disk Permissions Repair. Upon opening Disk Utility, I see my HD, then a grey horizontal line, and under that I see: decryptedFile.dmg then an icon of Flash Player under that. Seemed rather strange to see this in Disk Utility. Why is it showing up? Do I need to to be concerned? How do I get rid of it?

The automatic Flash update service downloaded it. If you've installed the update, choose Go to Folder from the Finder's Go menu, provide the path at the bottom of the Disk Utility's window without the file's name, and delete it from there.
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