diff --git a/src/main/java/org/verapdf/cos/filters/COSFilterAESDecryptionDefault.java b/src/main/java/org/verapdf/cos/filters/COSFilterAESDecryptionDefault.java
index 48281fe8..75a9326a 100644
--- a/src/main/java/org/verapdf/cos/filters/COSFilterAESDecryptionDefault.java
+++ b/src/main/java/org/verapdf/cos/filters/COSFilterAESDecryptionDefault.java
@@ -94,15 +94,15 @@ public int read(byte[] buffer, int size) throws IOException {
             this.getInputStream().skip(16);
             this.haveReadStream = true;
         }
-        int readDecrypted = this.readFromDecryptedBytes(buffer, size);
-        if (readDecrypted == -1) {
+        int readDecrypted = this.readFromDecryptedBytes(buffer, 0, size);
+        if (readDecrypted >= size) {
             return readDecrypted;
         }
 
         if (this.bufferSize() <= 0) {
             int bytesFed = (int) this.feedBuffer(getBufferCapacity());
             if (bytesFed == -1) {
-                return -1;
+                return readDecrypted;
             }
         }
         byte[] encData = new byte[BF_BUFFER_SIZE];
@@ -112,7 +112,11 @@ public int read(byte[] buffer, int size) throws IOException {
             byte[] fin = this.aes.doFinal();
             this.decryptedBytes = concatenate(this.decryptedBytes,
                     decryptedBytes.length, fin, fin.length);
-            return this.readFromDecryptedBytes(buffer, size);
+            if (readDecrypted == -1) {
+                return this.readFromDecryptedBytes(buffer, 0, size);
+            } else {
+                return readDecrypted + this.readFromDecryptedBytes(buffer, readDecrypted, size - readDecrypted);
+            }
         } catch (GeneralSecurityException e) {
             throw new IOException("Can't decrypt AES data.");
         }
@@ -159,12 +163,12 @@ private byte[] getAESInitializingVector() throws IOException {
         return initVector;
     }
 
-    private int readFromDecryptedBytes(byte[] buffer, int size) {
+    private int readFromDecryptedBytes(byte[] buffer, int from, int size) {
         if (decryptedBytes.length == decryptedPointer) {
             return -1;
         }
         int actualRead = Math.min(size, decryptedBytes.length - decryptedPointer);
-        System.arraycopy(decryptedBytes, decryptedPointer, buffer, 0, actualRead);
+        System.arraycopy(decryptedBytes, decryptedPointer, buffer, from, actualRead);
         decryptedPointer += actualRead;
         return actualRead;
     }
diff --git a/src/main/java/org/verapdf/pd/font/type1/Type1CharStringParser.java b/src/main/java/org/verapdf/pd/font/type1/Type1CharStringParser.java
index a1703a23..783cb814 100644
--- a/src/main/java/org/verapdf/pd/font/type1/Type1CharStringParser.java
+++ b/src/main/java/org/verapdf/pd/font/type1/Type1CharStringParser.java
@@ -99,8 +99,10 @@ protected boolean processNextOperator(int firstByte) throws IOException {
                     popStack(6);
                     break;
                 case 16:    // callothersubr
+                    // TODO: implement call other subr
+                    break;
                 case 17:    // pop
-                    //TODO: should we parse this?
+                    popStack(1);
                     break;
                 case 7:     // sbw
                     popStack(1);