These parsers are Arcsight Flexconnector Regex File type configurations files. The configuration files numbered from 1 to 4 are the files written for extraprocessors. The main configuration file is trendmicro.sdkrfilereader.properties.
For futher undertanding of the configurations that must be done during the installation of the flexconnector, please refer to Arcsight Flexconnector official dev guide document.
Note that about event categorization I also provided the required CSV file located in the directory acp. I recommend replacing the acp directory in the installation directory of your flexconnector with the one provided by this repository just as is.