If you are applying for permanent residency or citizenship in Brazil through the Federal Police, then yes, overseas documents will need to be either apostilled and/or legalised – that means your birth certificate, criminal record check, marriage certificate, divorce certificate – basically all documents issued abroad, except your passport.
An apostille is a legal seal which is affixed to the original document by the authority who originally issued it. So if your birth certificate was issued in Australia, then the Australian government need to apostille it. Each country have their own ways of doing things so you need to do your research. An apostille is an internationally recognised seal that shows the Brazilian authorities that the document is genuine.
We will provide all the guidance you need to ensure your documents issued overseas are legal to use in Brazil.