I would try to convert the PDF file to a Word file using Adobe Acrobat XI (File>Save As Other>MS Word). If this conversion is going well, you have Word pages that you insert into another Word document.
You can also copy&paste from your PDF file into the Word document.
If you want the actual PDF in your document, select Insert>Object>Adobe Acrobat Document - then select the PDF fiel you want to insert. If it's just a subset of pages from a document, you may want to extract those pages (using Acrobat) into a new document first, and then insert that new file into your Word document.
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...