'Installer' drive keeps showing up
I've been using a brand new 13' Macbook Pro w/ Retina for a couple weeks now, and this weird 'Installer' drive keeps mounting itself at least once a day. A drive will just show up on my desktop and every time i eject it, it mysteriously reappears. When I open the drive, there is just a installer package but I don't want to open it because I have no idea what it is. I've attached some screenshots for reference.
When I first got this computer a few weeks ago, I didn't restore from a Time Machine back-up or anything, I just moved my important data over and installed all of my apps and stuff brand new. Most of the applications on my computer are from the app store but theres a handful that I've downloaded from other sources. Have I downloaded some type of virus that wants me to unpack it from this installer?
Has anyone encountered something like this before?