I know Oracle altered its DB architecture from purely relational to object oriented/relational about version 9 so i think oracle extended the blob datatype that supported storing of bitmaps, images, files, etc., but soapui returns its query results in xml format.
Are you talking about reading the content of the data or just retrieving something that is returned if you query the blob column that contains the .pdf?
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta