Problem importing vectors in PDF generated in Illustrator into Autocad

I work in a company where we constantly need to model projects for Heineken and its sub-brands. A few days ago, the brand updated its logo and I'm having problems.

In Illustrator, I select the logo (vector) and remove the fill and add a black stroke and set a thickness for the stroke. After that, I select the logo and click on export selection (right mouse button, last option) and select .pdf and that's it.

When I open the .pdf file, it's perfect! The problem is that when I import the .pdf into AutoCAD, the logo comes out broken and with my lines missing and with fill in some parts.

Why do I do Illustrator > AutoCAD > Sketchup? When I export directly in .dwg and open it in Sketchup, the logo comes out with no details, all checkered, as if the number of segments was low.