Malicious PDF — malware analysis report

Static analysis result for SHA-256 a807a7e9a42f8fef…

MALICIOUS

PDF

6.3 KB
MD5: efcbe291adeed6334ed295c41c9ae06a SHA-1: 989ae9b94dc4ac90144be501b1f32bd7113ecc1e SHA-256: a807a7e9a42f8fef3456d47085472730f6773921aaf334d7a4a9cec18dbb382b
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains an embedded JavaScript stream that utilizes an eval() call, indicating an attempt to execute arbitrary code. The ML classifier strongly suggests malicious intent. While the specific JavaScript payload is not fully detailed, its presence within a PDF, combined with the eval() function, points to a common technique for delivering second-stage malware. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low 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)
  • 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#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin
2b22a85ac0714a783fb73a77c22bd116d984f8f0873070d47a899bfe1e8cd3cc		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 385 bytes

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