In Illustrator I exported a PDF as DXF and inserted it in QGIS as Vector and obtained two layers as points and lines but it is misaligned and in a unknown location.
I know georeference a raster file, but not a PDF or DXF.
The PDF file is the first one (named "Caracterização Geral") here in this link: Caracterização Geral PDF file. It say "PT-TM06/ETRS89".
This is the DXF file in my Google Drive.
I can locate one point, the City Hall - 41.1298608, -8.6066119 [41°07'47.5"N 8°36'23.8"W]. Is the layer called "Câmara_Municipal" in PDF file, a cyan color point.
My project is EPSG: 3857 / WGS 84 / Pseudo Mercator
First layer is a Bing Aerial (Web > OpenLayersPlugin > BingMaps >
Bing Aerial) - CRS: EPSG 3857 / WGS 84 / Pseudo Mercator
Another layers with shapefiles lines and points captured from OSM. - CRS: ESPG 4326 / WGS84, which is OK on top the base layer.