Malicious PDF — malware analysis report

Static analysis result for SHA-256 12170b0949c92192…

MALICIOUS

PDF

108.2 KB Created: 2010-03-16 17:24:27 +08:00 Authoring application: pdfFactory Pro www.pdffactory.com (via pdfFactory Pro 3.37 (Windows XP Professional Chinese))
MD5: a4ad444704775ecb1ed0e0a9298cc7d0 SHA-1: ddb4b031fcf4af8c00844b5b595e937740e307ea SHA-256: 12170b0949c92192623678ebba52ca0e9d6a4d588ae80caefe4e53f5238b1bbe
292 Risk Score

Malware Insights

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

The PDF contains JavaScript that leverages the CVE-2009-4324 vulnerability via the media.newPlayer API. This exploit is designed to download and execute additional malicious content. The presence of an embedded PDF with suspicious findings further supports the malicious nature of this document. The URL http://www.rsis.edu.sg was found within the document, though its reputation is unknown.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 10

  • 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. (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)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.rsis.edu.sg
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
bdf688e09ec8e974af91608ce2469ead33230ce6c8a836344fd8da5d983c2cb8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2578 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
font_00_sfnt_off0001308e.bin
a9a0089ab66dc7b8c49fbb9f2de0476149545b88f4725632a97b0dc739e0f8a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 9316 bytes
polyglot_child_pdf_off0000dfd7.pdf
9dc4d61c08a4f7e40c279a7ed5bb27df5e8e196f315d9bebdf42e45fa9125f3a		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xDFD7 53526 bytes
polyglot_child_pdf_off00019900.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x19900 6125 bytes

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