The name 'Cashew beetle' is from the Australian Museum's Christmas beetle app. You can download it to your phone, it's quite good, with lots of detail for each species.
In my opinion there isn't enough detail visible in the picture to identify it to species. It's best to get a good shot of the rear end with the pygidium at least, preferably also the underside. Could very well be A. porosus as well.
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