Please help with mask for 128 bit pdf key

[lelantos]

Thank you, but how can i determine collider mode, there is no info about this (or i can't find)?

I found only this in wiki:
10400 | PDF 1.1 - 1.3 (Acrobat 2 - 4) | Documents
10410 | PDF 1.1 - 1.3 (Acrobat 2 - 4), collider #1 | Documents
10420 | PDF 1.1 - 1.3 (Acrobat 2 - 4), collider #2 | Documents
10500 | PDF 1.4 - 1.6 (Acrobat 5 - 8) | Documents
10600 | PDF 1.7 Level 3 (Acrobat 9) | Documents
10700 | PDF 1.7 Level 8 (Acrobat 10 - 11) | Documents

Are there no collider modes for 1.4 - 1.6? Does this mean that i can't use ?b.. mask and should use only ?a..?