This question already has an answer here:

Is there any plugin for QGIS which would help me in exporting the map document as a geospatial PDF (similar to Terrago's GeoPDF)?

merged by PolyGeo Jun 30 '16 at 6:14

This question was merged with Can QGIS export Geospatial PDF for Avenza PDF map app? because it is an exact duplicate of that question.