Fake Adobe Flash Player Auto Download?

I got a purported auto Adobe Flash Player download today.  I came back to my computer after a while, and there it was, asking me to open or save the file.  I saved it.  When I opened the directory for my Downloads folder, I didn't recognize the icon for the saved file.  Meanwhile, Norton's automatic scan notice came up in the lower right corner of my screen, saying the file is safe.  When I double-click the file in the directory to run it, I get a warning notice about the publisher, Itgms Ltd., being blocked.  I never heard of Itgms and I get no hit for it in Google.  I had Norton scan it again and got another OK.  I mistrust this.  Is it real or is Norton failing to catch malware here?