Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9da6077225bcf3…

MALICIOUS

PDF

145.2 KB
MD5: 984d8d11dbb73b64dc42014ef21b2af9 SHA-1: 42815b02ea54cb1331275608935c79dd1b29e13d SHA-256: bc9da6077225bcf3bc27392db43335f273fac1d844469c80fa79323335d7348b
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1059.003 Windows Command Shell

The PDF contains embedded JavaScript, with high-confidence firings for eval() and unescape() calls, indicating code obfuscation and execution. A secondary embedded PDF was also detected with similar suspicious findings. The primary function of the embedded scripts appears to be the execution of obfuscated code, likely to download and run additional malicious content. No specific family could be identified due to the generic nature of the obfuscation.

Heuristics 7

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • 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.
  • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0052_000.js
45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d		 pdf-javascript-stream PDF /JS object 52 at offset 0x3F4E 301 bytes
javascript_obj0059_001.js
28d6113dc29ef94de179a1345b6983a9d947da00c945e958d0554de4748a5164		 pdf-javascript-stream PDF /JS object 59 at offset 0x6483 2612 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
stream_005_off00000b74.bin
e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB74 1000 bytes
objstm_0053_00.bin
f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39		 pdf-objstm-decoded PDF /ObjStm 53 0 obj (inflated) 50 bytes
polyglot_child_pdf_off0001d901.pdf
fb2b52d852722f9b426665a5f60047fc463cd643a8f13b317d15efab7307f861		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1D901 27574 bytes

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