diff --git a/src/main/java/org/verapdf/pd/PDPage.java b/src/main/java/org/verapdf/pd/PDPage.java
index 52274d65..d8289bb0 100644
--- a/src/main/java/org/verapdf/pd/PDPage.java
+++ b/src/main/java/org/verapdf/pd/PDPage.java
@@ -160,7 +160,12 @@ private static double[] getDoubleArrayForBox(COSArray array) {
             return null;
         }
         double[] res = new double[4];
-        for (int i = 0; i < array.size(); ++i) {
+        int size = array.size();
+        if (array.size() > 4) {
+            size = 4;
+            LOGGER.log(Level.WARNING, "BBox Array size is greater than 4 in COSArray");
+        }
+        for (int i = 0; i < size; ++i) {
             COSObject obj = array.at(i);
             if (obj.getType().isNumber()) {
                 res[i] = obj.getReal();