The attack happened in Cranham Drive, Warndon, Worcester, late on 17 July. The woman, who suffered bruising, was pushed into Chatcombe Drive.
Officers arrested one man nearby after the attack, but said they were still trying to trace the second man.
A spokesman described the incident as "despicable and barely believable".
'Despicable assault'
The second man is described as white, aged between 17 and 21 and of slim build.
He wore dark clothing and a baseball cap.
A spokesman for West Mercia Police said: "Despite it being comparatively late, we believe there were a number of other people around the area at the time.
"They may have seen something of this despicable and barely believable assault, before the two offenders ran off towards Tetbury Drive, leaving their victim on the ground."
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