How do you get rid of a pornography virus from the Internet browser on a Samsung Galaxy S5?

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AC Question

how do you get rid of pornography virus from Internet browser on samsung galaxy s5???

I have restored my phone back to factory settings than after made sure i do not let unkown sources be trusted in settings. i have 3 antivirus apps and none of them have picked up the virus. Everytime i open my Internet browser it vibrates and comes up with a message from android stating that my device is effected by not 1 but 2 virus from pornographic sites. please someone help me get rid of the virus?