Users of a common app that has been downloaded by Android phone and tablet users more than a million times have been warned to delete it. Experts at Malware Bytes say the app is aggressively displaying full-screen adverts, even when it is not in use.
The app appears to be a PDF reader - allowing you to read documents you may find onlne or which have been sent to you - but it takes over your phone and shows you adverts that take over your device's screen. The app is known as PDF reader - documents viewer. The experts said: "Aggressive behavior lands it in the realm of adware.
"Catching this adware in real time is a game of install and wait. It takes a couple of hours before the PDF app will display ads. This long delay is in order to make it harder to track down which app is causing the ads. For example, full-screen ads displaying immediately after install would likely result in quick a uninstall. "
