No this is not a kerambit, korambi...etc.
This is a
Siraui. The
Siraui is a small dagger
(Pisau) with a sturdy curved blade with an edge on the convex side. These daggers come in variety of shapes, the sheath often resembles the
Keris (a little).
See here for references.
http://perso.wanadoo.fr/taman.sari/d...raui/pkr02.htm
http://oriental-arms.co.il/item.php?id=1145