diff --git a/src/core/fonts.js b/src/core/fonts.js
index e838341af..2c9ffa94e 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -689,12 +689,17 @@ var Font = (function FontClosure() {
     }
 
     // Some fonts might use wrong font types for Type1C or CIDFontType0C
-    if (subtype === 'Type1C' && (type !== 'Type1' && type !== 'MMType1')) {
-      // Some TrueType fonts by mistake claim Type1C
-      if (isTrueTypeFile(file)) {
-        subtype = 'TrueType';
-      } else {
-        type = 'Type1';
+    if (subtype === 'Type1C') {
+      if (type !== 'Type1' && type !== 'MMType1') {
+        // Some TrueType fonts by mistake claim Type1C
+        if (isTrueTypeFile(file)) {
+          subtype = 'TrueType';
+        } else {
+          type = 'Type1';
+        }
+      } else if (isOpenTypeFile(file)) {
+        // Sometimes the type/subtype can be a complete lie (see issue7598.pdf).
+        type = subtype = 'OpenType';
       }
     }
     if (subtype === 'CIDFontType0C' && type !== 'CIDFontType0') {
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 72c0ca28c..06486ca08 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -35,6 +35,7 @@
 !issue7439.pdf
 !issue7446.pdf
 !issue7492.pdf
+!issue7598.pdf
 !filled-background.pdf
 !ArabicCIDTrueType.pdf
 !ThuluthFeatures.pdf
diff --git a/test/pdfs/issue7598.pdf b/test/pdfs/issue7598.pdf
new file mode 100644
index 000000000..d4e11bd35
Binary files /dev/null and b/test/pdfs/issue7598.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 493e04666..d1b2d613f 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1795,6 +1795,13 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue7598",
+       "file": "pdfs/issue7598.pdf",
+       "md5": "c5bc5a779bfcb4b234f853231b56cf60",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "issue7439",
        "file": "pdfs/issue7439.pdf",
        "md5": "56682657990a894c66db26560d3039d7",