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The woman managed to push the man - thought to be in his 20s - away from her before she ran off down Parkside Drive.
"The victim was uninjured but understandably shaken," he said.
"It was a very frightening situation."
Police said the attack appeared to be random. Officers reassured locals - many of whom were elderly - that they were determined to catch the man.
Members of the public who may have seen anyone acting suspiciously in the area at the time is being urged to contact police immediately.
The man is described as being tall and slender with a slim face. He is dark-skinned and is possibly of Asian, Indian or of Middle-Eastern ethnicity.
He has short dark hair and was wearing a dark long-sleeved shirt, long pants and sneakers.
Residents in the area who may have security footage that may help police are being asked to make contact urgently, in particular.
"We would like to hear from anyone else who lives in the area of Pūriri Ave, Centreway Rd, West Hoe Rd and Elizabeth St and who has a CCTV camera and hasn't yet been spoken to by police."
Can you help? Call 105 or CrimeStoppers anonymous on 0800 555 111