Bad Influence
Negative Impact, Harmful Effect
noun
影響 is "influence," so an evil influence is a bad influence.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
悪影響が自分の子どもにまで及んでいたことに気が付き、彼女は泣き出した。
She cried as she realized that her bad influence filtered down to her children.