Hi, I am having trouble determining how to fix or undo the paths of my imported PDF so I can change the lineweights and eventually add color. I exported my Rhino file (a 3-D modeling software) into a "Microsoft to PDF" format, but when I try to edit the pdf in Illustrator, it shows up more like a picture composed of squares rather than individuals paths, which has never happened to be before. I included a photo for reference.
I'm not sure why you chose "Microsoft PDF". Sounds like you simply picked the default MS Office export, which has nothing to do with Rhino's own PDF exporter. Also a shaded view is likely always going to export as raster images. Haven't used Rhino in ages, though, so there's always the chance things have changed.