Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35ffdc13fb7b2f4…

MALICIOUS

PDF

6.1 KB First seen: 2026-05-10
MD5: 827f41b902df1d2483474aa565f4d993 SHA-1: 56587bc0cfd09e24ed0dc5fbf6eb330c2e453e7f SHA-256: b35ffdc13fb7b2f44cd196619dcdf97f6d98c2961c22ab929fb769d46a17ec57
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript with an eval() call, indicating an attempt to execute arbitrary code. The presence of a decoded stream at offset 0x452 and the high-severity PDF_EVAL heuristic suggest the script is designed to download and execute a second-stage payload. No specific family could be identified, and the embedded URLs were confirmed as benign.

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
    /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/ eval(hvkoa6); /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/
  • 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) 557 bytes
SHA-256: b9d8d227054c92f7cf3fd90675779b0edf73c0a966c594da53c6c8dbdcb29688

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