diff --git a/module/knowledgecenter_update/Script/migrate_old_wiki.php b/module/knowledgecenter_update/Script/migrate_old_wiki.php
index 767f895..01b2fc1 100644
--- a/module/knowledgecenter_update/Script/migrate_old_wiki.php
+++ b/module/knowledgecenter_update/Script/migrate_old_wiki.php
@@ -162,6 +162,18 @@ function get_article_files(int $cid): array {
 
 function extract_pdf_text(string $filePath): string {
     if (!file_exists($filePath) || filesize($filePath) === 0) return '';
+
+    // pdftotext ist robuster bei gesicherten PDFs (nur Kopier-Schutz, kein Passwort)
+    $pdftotext = trim(shell_exec('which pdftotext 2>/dev/null') ?? '');
+    if ($pdftotext !== '') {
+        $escaped = escapeshellarg($filePath);
+        $out     = shell_exec("$pdftotext -nopgbrk $escaped - 2>/dev/null");
+        if ($out !== null && strlen(trim($out)) > 10) {
+            return preg_replace('/\s+/', ' ', trim($out));
+        }
+    }
+
+    // Fallback: pdfparser
     try {
         $parser = new \Smalot\PdfParser\Parser();
         $pdf    = $parser->parseFile($filePath);