Copy and Paste
The most obvious solution is to copy and paste the contents of a PDF file into Microsoft Word – however this isn’t always possible.
Certainly as far as text content goes, Adobe have spent a lot of time developing algorithms to encode the contents of PDF files to make it a successful portable and secure format that cannot be edited or plagiarized.
Older versions of Adobe Acrobat and Reader allowed users to copy text to the Windows clipboard, and this could then be pasted into a Microsoft Word document, but this is no longer the case. Later releases prevent the copying of almost all content, except images.
If your requirement is to simply paste an image from a PDF document into Word, this can easily be done using the Snapshot Tool. This is a function in the most recent version of Adobe Reader (available for free from Adobe.com) that can be found either on the toolbar or in the Tools menu. Simply open your PDF file and use this function to select the contents you require. Adobe Reader will automatically copy the contents to your Windows clipboard, making them available to be pasted into Microsoft Word.
Note that the most success using this method is in copying images from PDF files; text content may copy, however it may lose formatting or order.