I would like you to try this code as it gives me PDF converter output file i am not sure about accuracy .
InputStream is = new FileInputStream(new File("your Docx PAth"));
            WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage
                    .load(is);
            List sections = wordMLPackage.getDocumentModel().getSections();
            for (int i = 0; i < sections.size(); i++) {
                wordMLPackage.getDocumentModel().getSections().get(i)
                        .getPageDimensions();
            }
            Mapper fontMapper = new IdentityPlusMapper();
            PhysicalFont font = PhysicalFonts.getPhysicalFonts().get(
                    "Comic Sans MS");//set your desired font 
            fontMapper.getFontMappings().put("Algerian", font);
            wordMLPackage.setFontMapper(fontMapper);
            PdfSettings pdfSettings = new PdfSettings();
            org.docx4j.convert.out.pdf.PdfConversion conversion = new org.docx4j.convert.out.pdf.viaXSLFO.Conversion(
                    wordMLPackage);
            //To turn off logger
            List<Logger> loggers = Collections.<Logger> list(LogManager
                    .getCurrentLoggers());
            loggers.add(LogManager.getRootLogger());
            for (Logger logger : loggers) {
                logger.setLevel(Level.OFF);
            }
            OutputStream out = new FileOutputStream(new File("Your OutPut PDF path"));
            conversion.output(out, pdfSettings);
            System.out.println("DONE!!");
Hopefully this solution would be fine for your problem.
Thank you!!