We can use purePDF or AlivePDF ActionScript 3 libraries for creating PDF from Adobe Air.
This example code showing how to saved and stored a .JPG file on the device. this way you may save .PDF file also. I will show full PDF example here.
f = File.documentsDirectory.resolvePath(fil_name+".jpg"); stream = new FileStream(); stream.open(f, FileMode.WRITE); i = new JPGEncoder(80); bytes = new ByteArray(); bytes = i.encode(snapShot.bitmapData); stream.writeBytes(bytes, 0, bytes.bytesAvailable); stream.close();