I agree its likely to be and Amelora (genus) species. Looking ay Moths of Victoria (Part 5) both A. zophopasta and A. nebularia looked likely, but their detailed notes for both species' undersides did not match your underside shot (Image 4). Looking at the their photos of undescribed Amelora species I thought your moth most closely matched their 'Amelora sp.(7)'. I have not yet tried to match any of the very many named and un-named Amelora species shown on Bold Systems 4.