code: public void setFileAttachmentName(String name) {
  		put(PdfName.A, new PdfString(name, PdfObject.TEXT_UNICODE));
  	}
docs: If this dictionary refers to a child that is a file attachment added to a page,
  you need to specify the page with setFileAttachmentPage or setFileAttachmentPageName,
  and then specify the name of the attachment added to this page (or use setFileAttachmentIndex).
  @param name		the name of the attachment