But why is the user specifically asking about a PDF version? Perhaps because physical copies are hard to find, or they prefer digital access. Alternatively, it could be a mistranslation or misspelling. For example, maybe the individual's name is different in the original language. Some common Muslim names can have various transliterations. Could it be Muhammad Asad? No, that's different. Muhammad Ishaq? Not quite. Maybe "Dawud" refers to King David as a prophet in Islam, but the structure of the name still makes me think it's about an individual.