Is there a legally mandated filing fee and/or deposit?

The following is taken from ElectoralReform Green Paper- Strengthening Australia’s Democracy by the Departmentof the Prime Minister and Cabinet, Government of Australia, Part 2 (KeyElements of the Electoral Process), Chapter 13 (Dispute Resolution), pp195-196. 

Commonwealth arrangements

13.1 Disputesmay arise over the results of a federal election, or with regard to a number ofprocedural elements of the electoral process administered by the AustralianElectoral Commission (AEC).

[…]

At the time offiling the petition, the petitioner must lodge a deposit of $500 with theRegistry of the High Court as security for costs.