The short answer is that the characters in this document are what we call 'obfuscated', and you probably won't be able to use any off-the-shelf CPAN module to get the Cyrillic content out of PDFs like this.
However, my employer is in the business of extracting XML from PDFs, and we have the expertise to handle exactly this type of conversion. Please feel free to /msg me for more information.
Alex / talexb / Toronto
"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds
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