Hello Séverin,
Nice grab!
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				Another Sumatran?/Malay? strange dagger.     
 
The blade look like beladau blade but the hilt is very different. 
The blade also looks like the Lawi Ayam but I do not really know this family of weapons and I think that the blade may not be curved enough to be classified as Lawi Ayam.   
			
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 Certainly not a lawi ayam or korambi.
The hilt clearly is a variant of a badik. The red color might point to a coastal Malay community if the scabbard is original.
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				The sheath is in Suamtran/Malay style (The true color of red wood is a little browner and darker), but the adjustment with the handle is not good, I feel that it may not be the original sheath.  
			
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 Does the blade fit only very loosely?
If the blade feels suitable, it may just be a bit misaligned: It looks like it may have been shifted slightly upwards.
Regards,
Kai