(Optional) A 16-byte string that is the checksum of the bytes of the uncompressed embedded file. The checksum is calculated by applying the standard MD5 message-digest algorithm (described in Internet RFC 1321, The MD5 Message-Digest Algorithm; see the Bibliography) to the bytes of the embedded file stream.

(Optional) The date and time when the embedded file was created.

(Optional) A subdictionary containing additional information specific to Mac OS files (see Table 3.44).

(Optional) The date and time when the embedded file was last modified.

(Optional) An embedded file parameter dictionary containing additional, file-specific information (see Table 3.43).

(Optional) The size of the embedded file, in bytes.

(Optional) The subtype of the embedded file. The value of this entry must be a first-class name, as defined in Appendix E. Names without a registered prefix must conform to the MIME media type names defined in Internet RFC 2046, Multipurpose Internet Mail Extensions (MIME), Part Two: Media Types(see the Bibliography), with the provision that characters not allowed in names must use the 2-character hexadecimal code format described in Section 3.2.4, “Name Objects.”

(Optional) The type of PDF object that this dictionary describes; if present, must be EmbeddedFile for an embedded file stream.