Malicious PDF — malware analysis report

Static analysis result for SHA-256 53db1b1b3f7477d7…

MALICIOUS

PDF

682.7 KB
MD5: 598d2c9e25eca6ab1848cb61d05caa55 SHA-1: 62447ea1bc9f03b82f68847dd782257fcfc1ba35 SHA-256: 53db1b1b3f7477d7130929b15a9d1ddffcebf88628fc3a7f86deee70cdb61ea6
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL T1566.002 Phishing: Spearphishing Attachment

The PDF document contains embedded JavaScript and exploits CVE-2009-4324, indicated by the 'media.newPlayer' heuristic. The presence of a secondary embedded PDF with similar suspicious findings further supports this. The JavaScript stream, particularly 'javascript_obj0057_001.js', is likely responsible for downloading and executing a second-stage payload, although its exact functionality is obfuscated. The benign URLs extracted are not relevant to the malicious activity.

Heuristics 7

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • 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.
  • 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_obj0057_001.js
525a25e1b66ec2bfe53b584887b4f54d069836c2a2d7f67050b50197ca396ab1		 pdf-javascript-stream PDF /JS object 57 at offset 0x5500 2522 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 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_off000a3ecb.pdf
ddca2a6a089d3b8fc4911be41f3f45247ba99ae25297ed4039e7661c9237482e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA3ECB 27691 bytes

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