Get Document Information from PdfReader

import com.lowagie.text.pdf.PdfReader;

public class MainClass {

public static void main(String[] args) throws Exception {

PdfReader reader = new PdfReader("HelloWorldToRead.pdf");

System.out.println("PDF Version: " + reader.getPdfVersion());

System.out.println("Number of pages: " + reader.getNumberOfPages());

System.out.println("File length: " + reader.getFileLength());

System.out.println("Encrypted? " + reader.isEncrypted());

System.out.println("Rebuilt? " + reader.isRebuilt());

}