Thanks, @SukanyaDatta and yes, it looks very similar to Common Bluebottle - Graphium sarpedon :)
And the sub-species reported from Malaysia is Graphium sarpedon luctatius.
Looks a lot like Common Bluebottle. Graphium sarpedon
http://butterflycircle.blogspot.in/2009/01/life-history-of-common-bluebottle.html
Not 100 per cent sure...but surely similar. Please will you take a look?
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