Before searching for the PDF, one must understand the author. Sri Yamunacharya (also known as Alavandar) lived between the 10th and 11th centuries CE. He was the grandson of the great Acharya Nathamuni and the spiritual predecessor of Sri Ramanujacharya, the giant of Vishishtadvaita Vedanta.
"Knowing Me as the Supreme Ruler, the Protector of the universe, the Lord of all sacrifices, and the sole refuge of all souls—give up all other dharmas and surrender to Me alone. I will liberate you from all sins; do not grieve." gitartha sangraha yamunacharya pdf
Details the nature of the Supreme Being ( Paramatma ) and the path of Bhakti Yoga to reach Him. Before searching for the PDF, one must understand the author