Please don't do that i.e. "jump aeroplane".
1. Its nearly impossible (or just down right impossible) for you to get a legal job there without PR/work permit.
2. Once caught, you will be rounded and thrown into camps for illegals to be deported to Malaysia. (Just like how M'sia round illegal bangla, myanmar, etc and deport them)
3. Your passport will kena chop mati for 5 years. That means in 5 years you cannot visit any country.
4. More likely, after the 5 years, you will be rejected by many countries since you have a record of overstaying.
5. You will cause Malaysia to be blacklisted for overstaying, thus Aus will have tougher immigrations checks for the rest of the Malaysian

P.S. You can say you don't care about point no.4. But if i or any Malaysian catch you working in Aus with no PR or permit, we will NOT HESITATE TO COMPLAIN TO THE AUTHORITIES to get you deported. Don't "cause harm to your neighbours" coz we still want to go to Australia.

there are 1000 ways to earn money legally. You don't have to resort to illegal means to do it. If we allow that then the robbers, kidnappers, etc will also say they do it due to circumstances. Then how? simpathise with them as well? being poor or in a not so good situation does not give you the right to commit a crime (and that includes jumping aeroplane).