If you cannot find a legal PDF easily, consider these alternatives:
If you need the PDF for academic purposes (essay writing, exam preparation), consider purchasing the Basheer Sampoorna Krithikal (Complete Works of Basheer) e-book, which includes Premalekhanam along with Pathummayude Aadu, Ntuppuppakkoranendarnnu, and others. Premalekhanam Malayalam Novel Pdf
Important themes to note:
First published in 1943, Premalekhanam is a novella (short novel) centered around two characters: If you cannot find a legal PDF easily,
The Plot: Kesavan Nair is deeply in love with Saramma, but he feels inferior because of his poverty and lack of a job. He decides to write her a "love letter"—but not a typical one. Instead of a romantic poem, he writes a brutally honest, funny, and philosophical letter explaining why they shouldn't get married. He points out their religious differences, his poverty, and his unconventional beliefs. The Plot: Kesavan Nair is deeply in love
The novel unfolds through a series of letters and conversations, leading to a climax that is both hilarious and heartwarming. Basheer masterfully tackles themes like inter-religious marriage, caste, class, and rationalism decades before such topics became mainstream.