For reliable PDF creation from PostScript files, use:
Adobe Acrobat Distiller 5.0 is a legacy software originally released in
Converts .ps (PostScript) and .eps (Encapsulated PostScript) files into PDF 1.4 documents. Key Features:
When released in 2001, Distiller 5.0 introduced several advancements for professional document workflows: Improved Color Management
If you need the functionality of Distiller, you don’t actually need to hunt for an ancient version. Here is how you can get the same results for free using modern tools: