Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 a9f030ba70360112…

MALICIOUS

PDF / .VIR

145.2 KB
MD5: 60a7c0824616b70ca8977e7953925678 SHA-1: 8d32e76b93df8bca4997671c883cdc64ce6fb7eb SHA-256: a9f030ba70360112c2c568149fd5891abb0a0640fd9798652247ebf30f8972b6
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information T1204.002 Malicious File

The PDF contains embedded JavaScript, with critical heuristics firing for eval() and unescape() calls, indicating obfuscated code execution. A secondary embedded PDF was also found with similar suspicious findings. The primary function of the embedded JavaScript appears to be the download and execution of a second-stage payload, as suggested by the obfuscation and the presence of a secondary PDF artifact. The specific URLs extracted were benign, but the overall structure and heuristic firings strongly suggest a malicious downloader.

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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