"Neermathalam" – that could be a place, maybe a village or a location in Kerala since "Neermathalam" sounds like it could be a Malayalam term. "Pootha Kalam" might be a local term for a specific event, ritual, or cultural practice. The PDF they're referring to is likely a document that details this event or practice. The mention of "Free Download 298 - BEST" suggests that they found a search result (probably number 298) labeled as the best source for this PDF.