Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a9632e69bb6f85…

MALICIOUS

PDF

8.2 KB
MD5: d4147a5ffb069f7df4831290c3ad4767 SHA-1: 83ecf1b101b056c8b9772d7f6b7fbe6404bce3e4 SHA-256: b4a9632e69bb6f85af74e9495b93faa455bdcef3de04f3d8121c6381e1826cde
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscation, a common technique for malicious scripts. While no specific URLs were extracted as malicious, the script's nature strongly implies it's designed to download and execute a second-stage payload. The benign URLs present are standard RDF and Adobe namespaces and do not indicate malicious intent.

Heuristics 5

  • 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)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00000469.bin
1e022694f9445877b419d10b72fa36847b80f141b31f2164becd8ad85ac1e61f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x469 2604 bytes
objstm_0025_00.bin
a77998894cf78829db397138047f09ff3c23582c4b279bf610098ab6aa9f05a6		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 550 bytes

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