is my galaxy a7 attacked?

i think my phone is attacked. its poping up ads uncontrollably, downloading unknown apps in the background, restarting itself, going to home automatically. this happens mostly when data is enabled. how do i stop this annoying behavior because i cant use my phone anymore

Sounds like malware. Boot up in safe mode and delete any app you are suspicious of. Get a malware scanner like malwarebytes and check for baddies..