If you have access to PB.net or C# you could create a .net assembly that uses Microsoft.Office.Interop to do the conversion? A quick google search shows several tools that may do the trick too if you don't want to roll your own.
You can do that directly from Word using plugins available on MS. Obviously part of the answer depends on how you want to distribute the solution (or not).
What version of PB are you using? With the RichTextEdit control, it looks like you can insert a word document then save the contents as a pdf. Look at the InsertDocument and SaveDocument methods.
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