If you are seeing random pop-up ads asking to update Adobe Flash Player or Java within Internet Explorer, Firefox and Google Chrome, then your computer is infected with an adware or a potentially unwanted program.
These “Update Flash Player” or “Update Java” pop-ups are not created by the developers Adobe Flash Player or Java, instead by cyber criminals are using to spread adware and browser hijackers on user’s computer.
ที่มา : https://malwaretips.com/blogs/remove-fake-flash-player-update/