Malicious PDF — malware analysis report

Static analysis result for SHA-256 397fb50105c43a48…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 25c0e6462d4eedf1d4bdd8cda899bbbe SHA-1: df3c2e1a01b419ef7baef77e579d9e54c0c04b28 SHA-256: 397fb50105c43a482cc9195ffd7df7f0ea4a560bd755e4fb6ec5b218b741b3ec
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an unescape() call within the JavaScript stream suggests obfuscation or decoding of malicious content. While no specific malicious URLs or scripts were directly extracted, the structure points towards an attempt to execute arbitrary code, likely for payload delivery or exploitation. The benign URLs present are standard PDF metadata namespaces and do not indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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. (matched inside decoded stream)
  • 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
    function RandomVar8(RandomVar9){return unescape(RandomVar9.replace(/ARG/g,'%u'));}var RandomVar2 = RandomVar8('ARG9090ARG9090');
  • 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. (matched inside decoded stream)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 507 bytes
SHA-256: 0def7e639e84fd43709b93d67c836bfa168d2b29cde82113959aeded9e930c74

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