By UserForm, I assume you mean a vba custom dialog box.

If the original information is bookmarked or otherwise is a specified container like a tagged content control or document property in the original, you can do this with vba. Open the document in the background, grab the content, and close it.
See also:

• How can I get access to the Document Properties of a Word file without opening the document?
• How to use a single VBA procedure to read or write both custom and built-in Document Properties