How do I invoke Word PDFMaker from a macro?

It might not be a wise thing to explore.
http://support.adobe.com/devsup/devsup.nsf/docs/52841.htm

I have found enough information to script the conversion, but not the actual documentation. I'd still appreciate any pointers anyone could give me to the documentation for the AdobePDFMakerForOffice.PDFMaker object.

It would be pretty peculiar for this not to be documented since as far as I can tell, this is the only way to create PDF files from Word documents with functional intra- and inter-document hyperlinks. If there is a better, documented way please let me know by responding to this note!

In any case, since I haven't seen this explained anywhere it might be useful to post some notes here. To script a conversion that doesn't require user intervention, get a reference to the PDFMaker add-in object from Word. From that, use the GetCurrentConversionSettings (or GetDefaultConversionSettings) method to get an ISetting object. Set property OutputPDFFilename to the desired PDF filename, and property PromptForPDFFilename to False. After making any other desired setting changes, use the PDFmaker object's CreatePDFEx property to perform the conversion.

Here is a sample routine in Word VBA. Before you can run it, you must open the Word macro editor and using Tools > References, add a reference to your copy of AcrobatPDFMakerForOffice.tlb, in e.g. \Program Files\Adobe\Acrobat 8.0\PDFMaker\Office.

>
' ----------------------------------------------------
' ConvertToPDFWithLinks - convert the current document
' to a PDF file, in the same folder as the document
' ----------------------------------------------------

Sub ConvertToPDFWithLinks()
Dim pdfname, i, a
Dim pmkr As AdobePDFMakerForOffice.PDFMaker
Dim stng As AdobePDFMakerForOffice.ISettings

If Not ActiveDocument.Saved Then
MsgBox "You must save the document before converting it to PDF", vbOKOnly, ""
Exit Sub
End If

Set pmkr = Nothing ' locate PDFMaker object
For Each a In Application.COMAddIns
If InStr(UCase(a.Description), "PDFMAKER") > 0 Then
Set pmkr = a.Object
Exit For
End If
Next
If pmkr Is Nothing Then
MsgBox "Cannot Find PDFMaker add-in", vbOKOnly, ""
Exit Sub
End If

pdfname = ActiveDocument.FullName ' construct output name
i = InStrRev(pdfname, ".")
pdfname = IIf(i = 0, pdfname, Left(pdfname, i - 1)) & ".pdf"

' delete PDF file if it exists
If Dir(pdfname) <> "" Then Kill pdfname

pmkr.GetCurrentConversionSettings stng
stng.AddBookmarks = True ' make desired settings
stng.AddLinks = True
stng.AddTags = True
stng.ConvertAllPages = True
stng.CreateFootnoteLinks = True
stng.CreateXrefLinks = True
stng.OutputPDFFileName = pdfname
stng.PromptForPDFFilename = False
stng.ShouldShowProgressDialog = True
stng.ViewPDFFile = False

pmkr.CreatePDFEx stng, 0 ' perform conversion

If Dir(pdfname) = "" then ' see if conversion failed
MsgBox "Could not create " & pdfname, vbOKOnly, "Conversion failed"
End If
End Sub

' ----------------------------------------------------

The steps of deleting the pdf file if it exists before converting and checking for the file after conversion are necessary. If the output file cannot be created (permissions, read-only, open etc) CreatePDFEx does not throw an error. It's better to find out.

Note that Intellisense and the object browser can show you all of the available properties and methods of pmkr and stng. Here's the list, though I can't guarantee its accuracy -- I might have mistyped:

PDFMaker methods:
CreatePDF (retval as Long)
CreatePDFEx (settings as AdobePDFMakerForOffice.ISettings, retval as Long)
GetCurrentConversionSettings (byref settings as AdobePDFMakerForOffice.ISettings)
GetDefaultConversionSettings (byref settings as AdobePDFMakerForOffice.ISettings)

ISettings properties: (all Boolean except as noted)
AddBookmarks
AddLinks
AddTags
AdvancedTagging
AllowBleeds
AlwaysFlattenLayers
AttachSourceFile
ConversionRoute
ConvertAllPages
ConvertHiddenSlides
ConvertMultimedia
ConvertSpeakerNotes
CreateDocInfo
CreateFootnoteLinks
CreateLayers
CreateMetadata
CreateTextNodes
CreateThreads
CreateXrefLinks
FitToOnePage
InvokedFromFeat
IsAutomation
IsConversionSilent
JobOptions as String
LayoutBasedOnPrinterSettings
OpenLayerPane
OutputPDFFileName as String
PDFACompliance
PreserveSpotColor
PreserveTransparency
PrintActiveSheetOnly
PrintBleedMarks
PrintCropMarks
PromptForPDFFilename
PromptForSheetSelection
Reserved as Long
SaveAnimations
SaveSlideShowTransitions
SecuritySettings as Object
SendForReview
SendViaEmail
ShouldShowProgressDialog
ViewPDFFile

ISettings methods:
GetConversionRange (byref Range)
SetConversionRange (Range)