Don't know that one. On the Adobe front, I get my updates when I first boot up in the mornings. If you are getting the pop up when you open a pdf file, that would probably be genuine. Anything else just randomly popping up, you're right to be cautious. Maybe better to go to the Adobe site and download the latest free version of reader. Just be careful to click on the free reader software, because obviously there are all kinds of things on there to buy too.
Have you seen the one that puts up a Windows warning screen, saying you have a virus? Scam from a bunch of people who then get you to phone them, calling themselves the "Windows Support Centre", get you to give them access to your computer so they can show you various screens (fake ones) and get you to pay over the market price for security software. Not even illegal, as they are charging you for software plus installation and advice, and you voluntarily contacted them and they never said they were Microsoft. Check that one by clicking to close the window. The scam version asks you if you are sure you want to navigate away from that page. If your PC was showing you a genuine warning window, it wouldn't be a webpage, it'd just be a window.......