Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce30a85731d371a…

MALICIOUS

PDF

487.6 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: f261d441b85aa93717836578f1499b27 SHA-1: 6c1075665f621263b50aab240c6ed71f2f7d1464 SHA-256: bce30a85731d371a388c21fbe2873935229508b1fe09749aa6f99e91adf471f9
290 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that is heavily obfuscated but ultimately calls `media.newPlayer(null)`, a known indicator for the CVE-2009-4324 exploit. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of multiple embedded PDF objects and JavaScript streams further supports a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 9

  • 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. (identified after JavaScript deobfuscation)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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)
  • Suspicious extracted artifact medium 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.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ocsp.verisign.com0
    • 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/
    • http://crl.verisign.com/ThawteTimestampingCA.crl0
    • http://crl.verisign.com/tss-ca.crl0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
1d611ee7f03716e3d28cb3e60e25b6368cdc0174c0bcf881d1ca4a95b3cbfee6		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
stream_008_off0000d52b.bin
e1fdd172934d8bcc0f63d124b73e1153937c9f606bf1a3923b9cecece3c7f191		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD52B 355663 bytes
stream_009_off0003fa83.bin
84c82c7b7f990599df559ac40d823188e532c68c6eded107838492fdffb11b41		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FA83 383782 bytes
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
polyglot_child_pdf_off0000b50a.pdf
0a231eb7d044fa87a5eeecab75cc90f70f2ba04aed2913b8b917a5c1d2fadc9e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xB50A 453001 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off000786a6.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x786A6 6125 bytes

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