vvhedgehog

class Program
    {
        static string unicodePrefix = new string(new char[] { '\xFE', '\xFF' });
        static string EncodePdfInfoString(string s)
        {
            byte[] originalByteString = Encoding.Unicode.GetBytes(s);
            byte b; //swap pairs
            for (var i = 0; i < originalByteString.Length; i += 2)
            {
                b = originalByteString[i];
                originalByteString[i] = originalByteString[i + 1];
                originalByteString[i + 1] = b;
            }
            return unicodePrefix + Encoding.ASCII.GetString(originalByteString);
        }
        void SomeWork()
        {
                ...
                document.Info.Author = EncodePdfInfoString("Суслик");
                document.Save(selectedFullPathFile);
        }
}