Yes, 24 Dec is peak period for Oz to Philippines.Just thought I would add some pricing if it helps (from Google Flights).
MNL to AMS on 24 Dec and back on 13 Jan for $2626
Interestingly the price for CX and SQ has dropped as well to $3405 and $3838 respectively.
Getting to MNL still proving to be a challenge for an reasonable price even in Y.
However for many other days, Philippine Airlines has a sale on from Oz to MNL. J return fares from about A$2300. Ex SYD and MEL, 1-2-1 in J and aircraft newer than QF. See the PR website. Good travel agents such as My Travel Solution in MEL always beat the online price.