Is there a way to export PDFs with a black background?

The customer I'm working for uses AutoCAD for everything, so their standard is a black background.  I set SWE to have a black background so that everything would look the same when it's exported as DWGs later.  But in the meantime, I want to send PDFs, except they have a white background, which makes it almost impossible to see anything that's been drawn:

If anyone knows of a way to print PDFs with a black background, that would be amazing!  Thanks!