This is a widely used abbreviation / acronym in the Philippines.
Pubmat is short for the English phrase PUBlication MATerial.
This is what Americans refer to as an infographic or even an announcement poster.
People who design pubmats are often explicitly given credit.
The pubmat above was designed by the Manila Bulletin staff using data sourced from the Philippine Food and Drug Administration.
This seems like a uniquely Philippine English word. I have not seen any examples of this word being used in other places like the USA.