What is this aircraft (JSF prototype?)

I’ve run across these images which appear to be an early JSF mockup/prototype- I think made by LM. However the wing planform doesn’t match the X-35 and the intakes don’t match the X-32. It’s clearly not the BAE JAST either. I know I’ve seen it before, but I can’t figure out any info on it.

Pics:

It doesn’t appear to be a real aircraft- either a mockup or CG/illustration, but it’s a nice looking machine. Anyone know anything about it? Much thanks.