diff --git a/src/core/type1_parser.js b/src/core/type1_parser.js
index 76f5c3d2f..2b8bb659c 100644
--- a/src/core/type1_parser.js
+++ b/src/core/type1_parser.js
@@ -457,10 +457,14 @@ var Type1Parser = (function Type1ParserClosure() {
     if (encrypted) {
       var data = stream.getBytes();
       var isBinary = !(
-        isHexDigit(data[0]) &&
+        (isHexDigit(data[0]) || isWhiteSpace(data[0])) &&
         isHexDigit(data[1]) &&
         isHexDigit(data[2]) &&
-        isHexDigit(data[3])
+        isHexDigit(data[3]) &&
+        isHexDigit(data[4]) &&
+        isHexDigit(data[5]) &&
+        isHexDigit(data[6]) &&
+        isHexDigit(data[7])
       );
       stream = new Stream(
         isBinary