Fix regression from issue 3312

src/evaluator.js

@@ -1600,7 +1600,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
         var images = [];
         for (var q = 0; q < count; q++) {
           var transform = argsArray[j + (q << 2) + 1];
-          var maskParams = argsArray[j + (q << 2) + 2];
+          var maskParams = argsArray[j + (q << 2) + 2][0];
           images.push({data: maskParams.data, width: maskParams.width,
             height: maskParams.height, transform: transform});
         }

test/pdfs/issue3384.pdf.link

@@ -0,0 +1 @@
+http://mirror.math.ku.edu/tex-archive/macros/latex/contrib/overpic/opic-abs.pdf

test/test_manifest.json

@@ -1186,5 +1186,14 @@
       "md5": "48a808278bf31de8414c4e03ecd0900a",
       "rounds": 1,
       "type": "eq"
+    },
+    {  "id": "issue3384",
+       "file": "pdfs/issue3384.pdf",
+       "md5": "57e31e83c165f16609528ad5ec5825ba",
+       "rounds": 1,
+       "link": true,
+       "firstPage": 1,
+       "lastPage": 1,
+       "type": "eq"
     }
 ]