Hello Semar,
Alan would explain it better but a kris blade is normally constructed with a steel core in the inner part of the blade (and thus visible on the cutting edges which need to be hard and strong) and a iron/ pamor mix at the surface of the blade on both sides. The exposed part of the steel core on the edges is called slorok. In the case of your blade, this slorok is not clearly marked and the pamor is visible deep inside the blade (pejetan) which is unusual so this is why I wondered whether it has a steel core or not.
Regards