A PDF is also an SVG (Scalable vector graphic) and it could possibly still be a display issue unless you have printed it on plain paper already and it prints that way.
I haven’t etched a board in years now. I order my boards from Elecrow and get 5 100mm x 100mm professionally made boards for under $5 which is far less then it would cost to make a single PCB using toner transfer paper, etchant and copper clad board. Plus they are tested, have my choice of solder resist color, board thicknesses from 0.6 - 1.6mm and nice silkscreens all for that price.
There are many other places that have similar prices like Fusion PCB manufacturing (Seeedstudio) and Dirty PCBs but I prefer Elecrow myself. I’ve never had a bad board and if they find anything wrong with the solder resist or silkscreen during inspection they will remake them and send you all the PCBs. That means some times you will order 5 and get more just because the silkscreen is smudged or the color is off on some.