Fusible weapons do not bind on acquire, they bind on equip -- which is why AH is full of Rocksplitters and Fury Blades. Once equipped, they are BtC. Once upgraded in Cauldron of Sotra Kell they are again unbound -- the only example in DDO so far that I know of a Crafting ritual decreasing Bind status.
Marks of Sheshka, etc. are BtA on acquire.
My question is: Do Malleable weapons bind on acquire? I do not see any on AH, so my guess is yes. And if so, are they BtA or BtC? And are they bound if upgraded?