It can possibly be down with a macro, the only issue being that "pages" in Word is a little bit meaning less and it would be better if we knew that the pages to be deleted were all in a separate Section or Sections of the document.
However, if you have all of the documents in a folder by themselves, the following code should delete the first five pages from each:
Dim fd As Dialog
Dim strFolder As String
Dim strFile As String
Dim aDoc As Document
Dim i As Long
Set fd = Application.FileDialog(msoFileDialogFolderPicker)
With fd
.Title = "Select the folder that contains the files from which you want to delete the pages."
If .Show = -1 Then
strFolder = .SelectedItems(1) & "\"
Else
MsgBox "You did not select a folder."
Exit Sub
End If
End With
strFile = Dir$(strFolder & "*.doc")
While strFile <> ""
Set aDoc = Documents.Open(strFolder & strFile)
For i = 1 To 5
aDoc.Bookmarks("\page").range.Delete
Next i
aDoc.Save
aDoc.Close
strFile = Dir$()
Wend