Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bfeedf865f53b0…

MALICIOUS

PDF

6.2 KB First seen: 2026-05-11
MD5: c903dca986eca625f14ad9f843cc339f SHA-1: 8cb1847b064a1a16f23f15754af561c752aff4e0 SHA-256: 88bfeedf865f53b0063c7174a270d3bbd096814c76e2bb497a179113dfc3d1fb
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes an eval() function, a common technique for obfuscating malicious code. This JavaScript is likely designed to exploit a known PDF vulnerability to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploit indicators points to a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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
    eval(itkuy8);
  • 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_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 632 bytes
SHA-256: f0ca52959569c07f7f1597ef793139e1af0c65725484b57cc3aaaeff59457883

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