<extensionID>com.janumedia.ane.pdfreader</extensionID>

var pdfFile = File.documentsDirectory.resolvePath("download/mypdf-file.pdf");
// note : make sure to put your pdf to accessable path, usually inside documentsDirectory
var pdfReader:PDFReader = new PDFReader();
// check if it has PDF applicaton installed
pdfReader.hasPDFApplication(pdfFile);
// will return true if it has PDF application installed
// will return false if no PDF application installed
// open with default PDF installed application
pdfReader.openPDF(pdfFile);
// will return 4 types of string 
// PDFReader.SUCCESS when succcesfully open PDF application selection intent
// PDFReader.ERROR_NO_DEFAULT_APP when no PDF application installed
// PDFReader.ERROR when open intent failed
// PDFReader.FILE_NOT_FOUND when in correct file path

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />