5.16.2.3 Object(DN-Binary)
A value with the Object(DN-Binary) syntax is a UTF-8 string in the following format:
B:char_count:binary_value:object_DN
where:
B is a string literal that MUST be present.
Each : is a string literal that MUST be present.
char_count is the number of hexadecimal digits in binary_value.
binary_value is the hexadecimal representation of a binary value.
object_DN is an object reference in the format of Object(DS-DN).