No mainstream app goes back to 2003. You must rely on the PDF. However, apps like "Pambu Panchangam 2025" have a "History" mode that sometimes allows you to query 2003 data server-side.

For researchers looking specifically for planetary positions from 2003, it is often easier to use Vedic astrology software (like Jagannatha Hora or AstroSage) which uses the same calculation engine as the Pambu Panchangam. While this isn't the PDF book, it provides the exact data (Thithi, Nakshatra, Yoga, Karana) needed for calculations.

If you need the specific data from the 2003 edition, here are the best methods to find it:

Use an OCR (Optical Character Recognition) tool. Adobe Acrobat or Google Drive can attempt to enhance the text, but due to the Tamil font, manual reading is often necessary.