Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1be415c9049f1f5…

MALICIOUS

PDF

6.5 KB
MD5: 2df203c57b66b5fd147a1039720f8f15 SHA-1: 5a8702f02d7c67f4a54819a13f04e007703706ec SHA-256: a1be415c9049f1f5326a703e0e9a1694486db78535005521c9691ffd49fb01ad
64 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 JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation to hide malicious code. While no specific malicious URLs or scripts were directly extracted, the presence of these indicators points to an attempt to execute arbitrary code, likely for downloading a second-stage payload. The benign URLs present do not detract from this assessment.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin
caf040aadda5b69d6ed45c0608f8de4f2eafdf5b1b0f60211f8e72cfe8d373ed		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 503 bytes

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