The only photo I have seen with a spike like that on the forewing inner line is Chrysolarentia phaedra, but that usually has a white area on the forewing.
This to me seems to be a reasonably close fit to 'Unplaced externaria', (following the Australian Faunal Directory) albeit an apparently more worn specimen. See the comments for Sighting No 3383501 showing the taxonomy is in some doubt.