Despite references to the contrary, you can't truly embed a PDF file into any Microsoft Office document, at least under Windows. Simply stated, the various Microsoft Office document formats simply cannot accommodate even a major subset of the PDF imaging model!
If you follow Microsoft's advice to “open a PDF file” in Word, you get an attempt to match the PDF content with what Word supports. This might work for a very simple PDF file of a memo originally done in Word, but not much more. To start with, Microsoft Office cannot handle anything other than RGB colors, only one out of PDF's sixteen transparency blend modes, Type 1 fonts,
If you try embedding a PDF file in a Microsoft Office document under Windows, you will simply get an RGB bitmap representation of the page being embedded. It is obviously not searchable nor editable.