The 20-year-old woman says that the man in the sketch and another man grabbed her off a Westfield street around 3 a.m. Monday morning.
She says they threw her in a minivan and attacked her.
"Once they forced the 20-year-old female into the van, they held her there at knifepoint, forcibly attempted to remove her clothes, then proceeded to sexually assault her and robbed her of $450," said Captain David Wayman of the Westfield Police Department.
She had been walking home at from a friend's house along South Chestnut Street when she was grabbed.
Once her attackers looked away, she made a break for it.
"She struck the second person and was able to escape from the vehicle and ran from the car, once she got out of the car, the minivan fled in the opposite direction," Wayman said.
The area is residential, with lots of families and is tree-lined, so it's easy to assume its safe at any time.
Neighbors now say they will be more careful.
State Police are still working on the sketch of the second attacker, the driver.
The first sketch is of the man who grabbed her.
He is described as 40 to 45 years old, about 5'10" tall, about 170 to 180 pounds, with brown and gray hair.
This is the first attack of its kind in Westfield this year.