Create pdf files with pdBox

Good afternoon,

I'm trying to create a PDF file with pdBox, recording what it finds in the matcher of my application, but the created pdf goes blank Could anyone help me with this question?

PDFParser parser = new PDFParser(new RandomAccessBufferedFileInputStream(f.getAbsolutePath()));
                    parser.parse();
                    COSDocument cosDoc = parser.getDocument();
                    PDFTextStripper pdfStripper = new PDFTextStripper();
                    PDDocument pdDoc = new PDDocument(cosDoc);
                    PrintWriter arq = new PrintWriter(new File("C:\Tratados\" + f.getName())); //Diretório de saida
                    //PrintWriter gravarArq = new PrintWriter(arq);
                    List<String> linhasGravadas = new ArrayList<>();

                    for (int i = 1; i <= pdDoc.getNumberOfPages(); i++) {
                        pdfStripper.setStartPage(i);
                        pdfStripper.setEndPage(i);
                        String parsedText = pdfStripper.getText(pdDoc);
                        String aut = "";
                        String hora = "";
                        String data = "";
                        int Aut = 0, Data = 0, Hora = 0;
                        System.out.println("Pagina: " + i);
                        arq.println("Pagina: " + i);
                        Matcher matcherData = Pattern.compile("([0-9]{2}\/[0-9]{2}\/[0-9]{4})"/*"\b\d{8}\b"*/).matcher(parsedText);
                        Matcher matcherHora = Pattern.compile("\d{2}[:|;]\d{2}[:|;]\d{2}").matcher(parsedText);
                        Matcher matcherAut = Pattern.compile(/*"\s\b\d{9}\b|*/"\b\d{9}\b").matcher(parsedText);
                        int vAut = 0, vData = 0, vHora = 0;

                        if (!matcherAut.find()) {
                           System.out.println("Autorização: Não encontrado");
                           //arq.println("Autorização: Não encontrado");
                        } else {
                            //while (matcherAut.find()) {
                            Pattern pattern = Pattern.compile("\s^[0126789].*|^[0126789].*"); // Segundo Filtro (Elimina os que não começam com 3|4)
                            Scanner scanner = new Scanner(matcherAut.group()).useDelimiter(pattern);
                            Matcher matcher2 = pattern.matcher(aut);
                            while (scanner.hasNext()) {
                                aut = scanner.next();
                                if (!linhasGravadas.contains(aut)) {
                                    System.out.println("Autorização: " + matcherAut.group());
                                    arq.println("Autorização: " + matcherAut.group());
                                    Aut = Aut + 1;
                                }
                            }
                            //}
                        }