Hi Tom,
Thanks for the clarification. If you use the Place Image command, the grips will appear when you select the PDF image. If you used the Georeferenced Image command, then you will have to georeference it again; this creates an orientation file that can be used to insert the image into another file or application. When you georeference the PDF, you can coorelate multiple pixel/point pairs to locate/rotate/scale the image. After you do that, you will not want to move the PDF image again.
David
Note: In some cases, you may have to go into Advanced View Filter Settings to make an imported image selectable.