How to set the Icon Image in Acrobat lesser in size then button dimensions

Dear friends,

I need to resize/scale the button icon Image to dimensions which are lesser in size than button dimensions.

Let say I have this image where the icon Image scaled to the Button's dimensions -

And I need it like this -

The star is png image with transparency, thus red - it is just button's fill property.

Javascript solution needed, please.

Thanks a lot!!