Because I noticed some weird animated pop-ads on Match.com -- featuring a cartoonish Oprah and the like --- I searched my applications to see if I had downloaded any adware. The only thing odd in my Applications -- in the Utilities folder, actually -- was Adobe Flash Player Install Manager with a created date of July 13, 2015. I absolutely do not recall having intentionally downloaded it, so I'm worried about whether that application is adware or anything dangerous. When I tried to simply delete it by dragging the icon to Trash, a window asks me to enter my system password, which I have not done. Please, I would appreciate any explanations of what this actually is, how it got there, if it's a security threat, and if so, how to remove it?
I am on a Macbook Air running OS 10.10.3, using the latest version of Chrome.