You should be able to export the file to the JPEG format using File > Save as or File > Export. If none of these options are available, try installing a virtual PDF printer (CutePDF Writer). Open your file then go to File > Print. Print the PDF file and save it to your computer then use an application from the database of Software Informer to extract the document as JPG file. It may sound hard to accomplish, but, in fact, it's pretty easy.