Melbourne sex attacker on run a year on

Benita Kolovos

The victim of a sexual assault in Melbourne has spoken out, urging the public to help catch an "aggressive, almost monster-like animal" who tried to rape her.

Kim - not her real name - was running along the foreshore on Beaconsfield Parade at Middle Park between 11pm and 11.30pm on February 5, 2017, when she was grabbed from behind.

The 31-year-old initially thought a friend was pranking her.

"In the first second, I thought, 'is this a friend doing a prank?'" she said in a video to the media on Thursday.

"But then the weight, the way he squished me and pulled me down, I was like 'oh no, this is not a friend, this is serious.'"

Kim was pinned down, her head pushed into the sand, while the man tried to remove her pants.

"Basically he was just straight away trying to get his hands down my pants, pull them off," she said.

"I was screaming, blood-curdling screams ... there was no way I was going to let him do anything to me."

Her screams alerted a nearby man and a woman who came to her aid, along with two other men wearing white shirts.

As soon as the man was outnumbered his personality shifted from "(an) aggressive, almost monster-like animal" to apologetic, Kim said.

"(He said) 'I'm so sorry, I do bad things I can't help it' ... it was like he completely changed states," she said.

The offender then ran away.

At the time, a photofit image and CCTV footage was released of a man wanted in relation to the attack and the image has been released again.

Police are keen to speak to the woman who helped Kim, as well as one of the men wearing a white shirt, as both are yet to come forward.

Detective Senior Constable Boris Di Camillo said any piece of information, no matter how small, could prove crucial.

"We're hoping to be in a position where we can provide the victim with some form of justice, but to do that, we really need the public's help," he said in a statement on Thursday.

Kim was hopeful the man would be caught, to prevent him from hurting others and to give her some closure, saying "it will always be with me".

"It (was) very cruel and it's very selfish."