Selangor CID chief Senior Asst Comm Fadzil Ahmat said the 9pm brawl started when a man pushed another man at the venue.
"A small skirmish started and the management got involved and told them to disperse," he said in a statement on Tuesday (Sept 3).
However, both men met again at the venue's motorcycle parking lot and were later joined by 10 others.
There, the victim was attacked with helmets, knives and chairs.
SAC Fadzil said the victim's friends tried their best to mitigate the situation but failed, and the victim suffered injuries to his waist and genitals.
He said the case is investigated under Section 148 of the Penal Code for possessing weapons or missiles at a riot.
Farhash, who is also political secretary to PKR president Datuk Seri Anwar Ibrahim, could not be reached for comment.
Earlier, Farhash had dismissed rumours that he had been involved in a fight.
This came after a text message that went viral claiming that he had injured a man out of dissatisfaction after losing a court case involving the latter.
He was reported in Sinar Harian as saying that the viral message was fake and was an attempt by his political rivals to discredit him.
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