Disk Utility Showing a dmg

I was going to run Disk Permissions and when I opened it up, there is a decrypted file.dmg showing. Here is it's path:

/var/folders/2d/vmlqi1 d0gzcs7mxi nnl 1w0000gn/T /decryptedFile.dmg

I opened it and saw that it has something to do with installing Adobe Flash Player. I remember downloading and installing it a couple of days ago. I've adonw this previously, but never had the disk image show up in Disk Utility before. How can I get rid of it? It seems to be in a folder calledl "T" that I can't find anywhere.