Malicious PDF — malware analysis report

Static analysis result for SHA-256 2958a8136cee319f…

MALICIOUS

PDF

6.4 KB
MD5: 13227b465d021efadf10343f00460cfd SHA-1: bbf1249d1e98afdfb156af8657d352ff70708e34 SHA-256: 2958a8136cee319f3ed54b67835f812ab1e00e4213055a56ed56749549fbf22e
66 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, PDF_UNESCAPE, and PDF_FROMCHARCODE. The JavaScript stream, found at offset 0x56B and further processed as objstm_0024_00.bin, appears to be obfuscated. While no specific malicious URLs or commands were directly extracted, the presence and nature of the obfuscated JavaScript strongly suggest it is designed to download and execute a second-stage payload. The benign URLs extracted are standard RDF and Adobe XMP namespaces and do not indicate malicious activity.

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
7dea6f864fc86ee9316fb8719acdbbe141f61cbe9135c883386383dc16caac38		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 508 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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