Deprecated: RC4 with a 128-bit key derived from the user password: V 2, revision 3. PDF 1.4.
V
Rc4 = 2
ISO 32000-2 §7.6.3.2 (Algorithm 1), §7.6.4.3.2 (Algorithm 2), §7.6.4.4.2-§7.6.4.4.4 (Algorithms 3 and 5).