Some PDF are printed out with empty squares replacing the text
I have some bills from my electricity and gas provider and all the bills are printed out with squares being displayed instead of text. I already restored the Font Book to default fonts. I have no problems with viewing any of those bills on my computer. I have other PDFs and they are all printed out correctly. If I open up the PDF which is printed out badly and export it to PDF within PREVIEW app, the output is same as on my printer. I tried to restore all fonts to default ones and I tried to reinstall last OSX update with combo update, still the same.
What else can I do to restore the normal printing?
MacBook Pro (15-inch Mid 2009), OS X El Capitan (10.11.6), Crucial 8GB DDR3, Samsung 840 Pro 256MB