To store a pdf in the db, we just use an image data type in sql server. It is pretty much the same as putting anything else in the db, except the sql parameter for the file would be something more like
Dim imagebytes(uploadcntrl.PostedFile.InputStream.Length) As Byte
uploadcntrl.PostedFile.InputStream.Read(imageBytes, 0, imagebytes.Length)
where uploadcntrl is an asp:FileUpload
As for converting a word doc to a pdf however, I haven't the faintest idea on how one would accomplish that. There might be some third party software that could handle it, but I have no idea how one would code that up.