/**
 * @param args the command line arguments
 * @throws java.io.IOException
 */
public static void main(String[] args) throws IOException {
    PDDocument document = new PDDocument();
    PDPage blankPage = new PDPage();

    document.addPage(blankPage);

    PDDocumentInformation info = document.getDocumentInformation();
    info.setAuthor("Mark");

    document.save("");
    document.close();
}

Creates a new PDF Document with a single page, sets the author and then saves.

PDFBox: Add author to PDF Document

Java