System and method for detecting potentially harmful data

A method includes receiving electronic data, extracting a first identifier from the electronic data, extracting first attributes from the electronic data, and searching a database for identifiers that match the first identifier to determine a number of matching identifiers. The method also includes determining that the number of matching identifiers exceeds a first threshold and searching the database for attributes associated with each of the matching identifiers to determine a subset of matching attributes. The method further includes calculating a specificity for the subset of matching attributes, determining that the specificity of the subset of matching attributes is less than or equal to a second threshold, and creating a filter based at least in part on the determination that the specificity of the subset of matching attributes is less than or equal to the second threshold.