PDF malware analysis — malicious · 12018fa7f267f985

MALICIOUS

PDF

155.5 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)

MD5: 4ee80f592449eff3022eddc9304f9763 SHA-1: 88c7c9b319b025200f4a271554ef87e39a10ed22 SHA-256: 12018fa7f267f98597c9f7c8765af0d06560771197578d15c4f1738e3fd0ff93

290 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer function. This exploit is designed to download and execute a secondary payload, as indicated by the critical heuristic firings and the deobfuscated JavaScript snippet. The obfuscated JavaScript and the presence of a secondary embedded PDF further suggest a multi-stage attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://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.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `5d09423d79dd94f6adecdafe803a83f63c148a753c267501c671ba76b37b7c4b`	pdf-javascript-stream	PDF /JS object 21 at offset 0x514	2119 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).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x514	126 bytes
`font_00_sfnt_off0001e299.bin` `49ac7acf25d625600644a634e0626dbf6b27c713f3becf88b3318296faae66d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E299	91784 bytes
`font_01_sfnt_off000203e2.bin` `9bacc8eee95defa3d70a2eec875abf1c55b1ffd6c4214324f66e65ac687ad659`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x203E2	100528 bytes
`polyglot_child_pdf_off0001db02.pdf` `0f3de6d2a34e2a2c7e470d467c7484e9dc6e94583e20842a81e0884f20b7aacc`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1DB02	37620 bytes
`polyglot_child_pdf_off00025609.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x25609	6125 bytes

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