Whatever i use as application to print PDF (Okular or Document viewer) each time i printer a PDF on my Canon LBP 6670 each page is only a solid black rectangle.
When i use in Okular "Rasterization" all pdf document is correctly printed, so no more solid black instead of text.

Why ? what does it mean ?
obviously the CUP or printer driver is not the root cause as it prints well when Rasterization is checked.

Is there any other software that print correctly without setting rasterization ?

I precise that pdf is a scanned document originally.