You might want to have a look at http://social.msdn.microsoft.com/Forums/office/en-US/e48b3126-941d-490a-85ee-e327bbe7e81b/convert-specific-word-pages-to-pdf-in-c?forum=worddev
It shows how you can get a specific range of pages from a word document (with preserved formatting).
Relevant parts (in case the linked page vanishes):
Open an instance of word.
Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();
And load your document. After opening the file you have to prepare the range for your selection. Count and count2 are the page numbers that you would provide in your special case.
object what = WdGoToItem.wdGoToPage;
object which = WdGoToDirection.wdGoToFirst;
object count = 1;
Range startRange = word.Selection.GoTo(ref what, ref which, ref count, ref oMissing);
object count2 = (int)count + 3;
Range endRange = word.Selection.GoTo(ref what, ref which, ref count2, ref oMissing);
endRange.SetRange(startRange.Start, endRange.End - 1);
endRange.Select();
Selection.Copy() then copies the selected pages to the Clipboard while preserving the formatting.
word.Selection.Copy();
The rest of the source creates a new document in which your selection is pasted.
word.Documents.Add();
word.Selection.Paste();
object outputFileName = "d:\\test1.doc";
object fileFormat = WdSaveFormat.wdFormatDocument97;
word.ActiveDocument.SaveAs(ref outputFileName,
ref fileFormat, ref oMissing, ref oMissing,
ref oMissing, ref oMissing, ref oMissing, ref oMissing,
ref oMissing, ref oMissing, ref oMissing, ref oMissing,
ref oMissing, ref oMissing, ref oMissing, ref oMissing);
I hope this helps a bit.