The man, believed to be in his 30s, approached the woman on the street while making comments and attempting to expose himself.
He was wearing grey track pants and a black coat when the incident occurred Thursday night.
Police say the woman tried to dial 911 but was thrown to the ground.
She scrambled to her feet, ran to a nearby apartment and called police as the man fled.
The man is described as having a moustache and hair to his jaw line.