This code quickly documents how you can extract all of the bookmarks in a PDF file and convert them into annotations (Sticky Notes) in Laserfiche Workflow 9.x and above. You may or may not need to install the iTextSharp PDF module as I believe it is installed with Workflow.

namespace WorkflowActivity.Scripting.ProcessPDFfile
{
    using System;
    using System.Collections.Generic;
    using System.Threading;
    using System.ComponentModel;
    using System.Data;
    using System.Data.SqlClient;
    using System.Text;
    using Laserfiche.RepositoryAccess;
    using Laserfiche.RepositoryAccess.Common;
    using System.IO;
    using iTextSharp;
    using iTextSharp.text;
    using iTextSharp.text.pdf;
    using System.Linq;

    /// <summary>
    /// Provides one or more methods that can be run when the workflow scripting activity is performed.
    /// </summary>
    public class Script1 : RAScriptClass92
    {

        DocumentInfo doc;

        public void recursive_search(IList<Dictionary<string, object>> kidsList)
        {
            for (int x = 0; x < kidsList.Count; x++)
            {
                string action = kidsList[x]["Action"].ToString().ToLower();
                string title = null;
                int page = 1;


                if (action == "goto")
                {
                    title = kidsList[x]["Title"].ToString().Trim();
                    page = int.Parse(kidsList[x]["Page"].ToString().Split(' ')[0]);
                    this.add_annotation(page,title);
                }
                else if (action == "uri")
                {
                    title = kidsList[x]["Title"].ToString().Trim();
                    this.add_annotation(page,title);
                }
                if (kidsList[x].ContainsKey("Kids"))
                {
                    IList<Dictionary<string, object>> subKidsList = (IList<Dictionary<string, object>>) kidsList[x]["Kids"];
                    this.recursive_search(subKidsList);
                }
            }
        }
        private void add_annotation(int pageno,string title){
            PageInfo pi = doc.GetPageInfo(pageno);
            NoteAnnotation na = new NoteAnnotation();
            na.Text = title;
            na.Position = new LfPoint(0,0);
            pi.AddAnnotation(na);
        }

        private void get_bookmarks(PdfReader opdf){
            using (PdfReader pdfReader = opdf)
            {
                IList<Dictionary<string, object>> bookmarks = SimpleBookmark.GetBookmark(pdfReader);

                for (int i = 0; i < bookmarks.Count; i++)
                {
                    string action = bookmarks[i]["Action"].ToString().ToLower();
                    string title = null;
                    int page = 1;

                    if(action == "goto")
                    {
                        title = bookmarks[i]["Title"].ToString().Trim();
                        page = int.Parse(bookmarks[i]["Page"].ToString().Split(' ')[0]);
                        this.add_annotation(page,title);
                    }
                    else if (action == "uri")
                    {

                        title = bookmarks[i]["URI"].ToString().Trim();
                        this.add_annotation(page,title);

                    }

                    if (bookmarks[i].ContainsKey("Kids"))
                    {
                        IList<Dictionary<string, object>> kids = (IList<Dictionary<string, object>>)bookmarks[i]["Kids"];
                        this.recursive_search(kids);
                    }
                    }
                }
        }
        protected override void Execute()
        {

            // Write your code here. The BoundEntryInfo property will access the entry, RASession will get the Repository Access session
            // Get bound entry as DocumentInfo object
            string tmpPath = Path.GetTempPath();
            FileStream lfFile;
            LaserficheReadStream lfStream;
            doc = (DocumentInfo)this.BoundEntryInfo;

            if (doc.PageCount > 0){
            string outputFile = Path.GetTempFileName();
            string contentType;
            using (lfStream = doc.ReadEdoc(out contentType)){
                using (lfFile = File.Create(outputFile)){
                    lfStream.CopyTo(lfFile);
                }
            }

            if(File.Exists(outputFile)){
                using(PdfReader pdfReader = new PdfReader(outputFile)){

                    this.get_bookmarks(pdfReader);

                }
                FileInfo tmpFile = new FileInfo(outputFile);
                tmpFile.Delete();
            }
            }
        }
    }
}