diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index edc988b96..f8e49da5c 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -1738,11 +1738,18 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
       if (baseEncodingName) {
         properties.defaultEncoding = getEncoding(baseEncodingName).slice();
       } else {
-        encoding = (properties.type === 'TrueType' ?
-                    WinAnsiEncoding : StandardEncoding);
+        var isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
+        var isNonsymbolicFont = !!(properties.flags & FontFlags.Nonsymbolic);
+        // According to "Table 114" in section "9.6.6.1 General" (under
+        // "9.6.6 Character Encoding") of the PDF specification, a Nonsymbolic
+        // font should use the `StandardEncoding` if no encoding is specified.
+        encoding = StandardEncoding;
+        if (properties.type === 'TrueType' && !isNonsymbolicFont) {
+          encoding = WinAnsiEncoding;
+        }
         // The Symbolic attribute can be misused for regular fonts
         // Heuristic: we have to check if the font is a standard one also
-        if (!!(properties.flags & FontFlags.Symbolic)) {
+        if (isSymbolicFont) {
           encoding = MacRomanEncoding;
           if (!properties.file) {
             if (/Symbol/i.test(properties.name)) {
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 546382bea..468e29b3f 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -37,6 +37,7 @@
 !issue7446.pdf
 !issue7492.pdf
 !issue7544.pdf
+!issue7580.pdf
 !issue7598.pdf
 !filled-background.pdf
 !ArabicCIDTrueType.pdf
diff --git a/test/pdfs/issue7580.pdf b/test/pdfs/issue7580.pdf
new file mode 100644
index 000000000..d9f473649
--- /dev/null
+++ b/test/pdfs/issue7580.pdf
@@ -0,0 +1,85 @@
+%PDF-1.7
+%âãÏÓ
+1 0 obj 
+<<
+/FontName /ArialMT
+/StemV 50
+/Ascent 0
+/Flags 32
+/Descent 0
+/ItalicAngle 0
+/FontBBox [-46 -210 980 728]
+/Type /FontDescriptor
+/CapHeight 0
+>>
+endobj 
+2 0 obj 
+<<
+/Pages 3 0 R
+/Type /Catalog
+>>
+endobj 
+3 0 obj 
+<<
+/MediaBox [0 0 200 50]
+/Kids [4 0 R]
+/Type /Pages
+/Count 1
+>>
+endobj 
+4 0 obj 
+<<
+/Parent 3 0 R
+/Resources 
+<<
+/Font 
+<<
+/F1 5 0 R
+>>
+>>
+/MediaBox [0 0 200 50]
+/Type /Page
+/Contents 6 0 R
+>>
+endobj 
+5 0 obj 
+<<
+/BaseFont /ArialMT
+/LastChar 249
+/Subtype /TrueType
+/FontDescriptor 1 0 R
+/Widths [278 0 0 0 0 0 0 0 0 0 0 584 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 0 0 0 0 0 1015 667 667 722 722 0 611 0 0 278 500 667 0 0 722 0 667 0 722 0 611 0 667 0 0 0 0 0 0 0 0 0 0 556 556 500 556 556 278 556 556 222 222 500 222 834 556 556 556 0 333 500 278 556 501 722 497 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 889 0 0 0 0 0 0 0 611]
+/Type /Font
+/FirstChar 32
+>>
+endobj 
+6 0 obj 
+<<
+/Length 60
+>>
+stream
+BT
+10 20 TD
+/F1 18 Tf
+(Issue 7580: ae,\361 - o,\371.) Tj
+ET
+
+endstream 
+endobj xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000177 00000 n 
+0000000228 00000 n 
+0000000310 00000 n 
+0000000439 00000 n 
+0000001123 00000 n 
+trailer
+
+<<
+/Root 2 0 R
+/Size 7
+>>
+startxref
+1235
+%%EOF
diff --git a/test/test_manifest.json b/test/test_manifest.json
index bc8b0412c..edc59c813 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1615,6 +1615,20 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue7580-eq",
+       "file": "pdfs/issue7580.pdf",
+       "md5": "44dd5a9b4373fcab9890cf567722a766",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
+    {  "id": "issue7580-text",
+       "file": "pdfs/issue7580.pdf",
+       "md5": "44dd5a9b4373fcab9890cf567722a766",
+       "rounds": 1,
+       "link": false,
+       "type": "text"
+    },
     {  "id": "issue6612-text",
        "file": "pdfs/issue6612.pdf",
        "md5": "657f33236496916597cd70ef1222509a",