I have this problem with Adobe Reader DC, where it always produces those artifacts, shown in the pictures, when I click into the text. Upon opening the document everything is fine. But when I click to e.g. copy and paste something it makes the text unreadable. Scrolling out of the corrupted part fixes the problem, but only until I click again.
Maybe someone can help me. I newly installed it serveral times. Have no clue, what could cause that error.