Malayalam Calendar 2001 followed in Kerala is provided by the Deepika Newspaper. The 2001 Malayalam calendar contains important festivals in Kerala and uses Malayalam language to mention Nakshatram and festival details. This Kerala calendar of 2001 of Deepika is not in pdf format but in jpeg format. But you can save the webpage or image format and use it.
You can visit the newspaper website and download it here - Deepika Malayalam Calendar 2001.
You can try this link or use the main calendar link.