If you're looking for the PDF, I have some bad news:
Here's what I could find:
The Necronomicon is a fictional book of dark knowledge in H.P. Lovecraft's Cthulhu Mythos. hr giger 39s necronomicon pdf verified
By H.R. Giger.
The copyright laws protect H.R. Giger's work. If you're looking for the PDF, I have
The book you might be referring to seems to be: If you're looking for the PDF