Some of the Acrobat tool names vary, depending on which version you're using. Perhaps I've confused things by referring to tool names not on the latest version (Reader X). In Acrobat Reader X, I believe the default is for text selection/copying, and you can right-click the toolbar to add the snapshot tool.

When you do text selection, you can select individual letters/words/lines/paragraphs, etc., but not graphics. Thus, you can copy the text from the PDF and paste it into a Word document. If you want graphics as well, you can use the snapshot tool to select the desired region and copy that as an image for pasting into the Word document.

Of course, if the PDF is itself just a multipage TIFF image or the like, with no real text, then all you'll have available for selection is a graphic - even though it might look like text. In that case, anything you copy/export from the PDF may not be editable in Word. It can get a bit confusing at this point because, in some multipage TIFF PDFs, you can actually select the text. When you export these files to Word, what you may end up with is an image overlaying the text, which is hidden behind it.

Can you post a copy of the PDF, or a link to it, so we can see what kind it is?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]