/**
 * @param args the command line arguments
 * @throws java.io.IOException
 */
public static void main(String[] args) throws IOException {
    File file = new File("");
    PDDocument document = PDDocument.load(file);
    
    Splitter splitter = new Splitter();

    List<PDDocument> Pages = splitter.split(document);
    
    Iterator<PDDocument> iterator = Pages.listIterator();
    
    for(int i = 1;iterator.hasNext();i++) 
    {
        PDDocument pd = iterator.next();
         pd.save("" + i + ".pdf");
    }

    document.close();
}

Opens an existing document and splits it into multiple documents, one for each page.

PDFBox: Split document into multiple pages

Java