What's on this moth? (1 Viewer)

So a few minutes ago I found this moth - which I've not yet identified - that was struggling on a tile walkway. I took it in and inspected it and found it had this growth or attached filament thing which looks like it may be part of its cocoon that was attached to its left eye and antenna. My question then is: is my guess that the cocoon stuck to the moth when it was metamorphosing correct? and is this common?

All theories and information is very welcome and appreciated.

From what I can see, it appears to be parts of the pupal case that are still attached to the appendages (antennar and legs), which means that it didn't quite emerge properly. This does happen and will probably result in its early demise.

Nyctemera sp.
Erebidae, Arctiinae, Arctiini

I agree with Martin Honey - looks as though the moth didn't eclose properly.