Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f25c218f7f7aef…

MALICIOUS

PDF

107.4 KB Created: 2010-06-02 21:04:47 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: a1731e6c38d8bab7a6e7fcb6e1cf0267 SHA-1: fb0e97ac97a5668154430737ffe5e31f2c5a8c55 SHA-256: 60f25c218f7f7aef66f2b6cd3a3f1280c054c77f82d6a43cfbbcadaec8422c9e
290 Risk Score

Malware Insights

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

The PDF file contains JavaScript that leverages the CVE-2009-4324 vulnerability by calling media.newPlayer. This exploit is designed to download and execute a secondary payload. The presence of multiple heuristic firings related to JavaScript exploits and obfuscation, along with the critical CVE-2009-4324 finding, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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. (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)
  • 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.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_002_off00000329.js
6b584e6f4e500df3765cd9cca06cdcc7a0f50b8b58abea8677fdb45755d0472d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 2658 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 0x329 126 bytes
objstm_0024_00.bin
5e33c5e97bbc41469ea4328ae48aa20389a4ed5a4c9608e42a4e56b7bc98859c		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 332 bytes
font_00_sfnt_off0000f8d9.bin
1e4137f643cc73ce82cfae6b43268b45b40b3d2db15add7d791017434f397888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 75672 bytes
polyglot_child_pdf_off00009e01.pdf
7f229e2323569a062df1754a12f390814b13422cab3017bbd9c5a59b4b6a0ea9		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x9E01 69558 bytes
polyglot_child_pdf_off000195ca.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x195CA 6125 bytes

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