Malicious PDF — malware analysis report

Static analysis result for SHA-256 000f6a4a5f567e2b…

MALICIOUS

PDF

297.6 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: c538086dc40c65fdf231eccc3ede6948 SHA-1: 7ed0a6852e5bf9c5498aa4f3571c888086ca196a SHA-256: 000f6a4a5f567e2bd569c221a98a7fcaf7de7075318703e23b9eaa69cbf880cf
292 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability through the media.newPlayer API. The JavaScript attempts to obfuscate a payload, which is then decoded and likely executed. This indicates a drive-by download or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8463

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.
  • 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.
  • 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.eccj.or.jp/
    • http://www.anzen.mofa.go.jp/
    • http://www.mofa.go.jp/mofaj/toko/passport/index.html
    • http://www.kaigai-anzen.net
    • http://www.nta.go.jp
    • http://www.green.or.jp/
    • http://www.fdma.go.jp/
    • http://www.rinya.maff.go.jp/
    • http://www.mhlw.go.jp/bunya/kenkou/woman.html
    • http://www.meti.go.jp/product_safety/index.html
    • http://www.maff.go.jp/j/keiei/kourei/danzyo/index.html
    • http://www.weli.or.jp/index.html
    • http://www8.cao.go.jp/syokuiku/index.html
    • http://www.mlit.go.jp/tochimizushigen/mizsei/tochimizushigen_mizsei_tk1_000013.html
    • http://www.jatahq.org/
    • http://www.wmo.int/pages/index_en.html
    • 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
ef0df738ea4838a812ef6359f0ec5d2c26f5d6fb884b59c3698f1159e33488ac		 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_off00028187.bin
5ebd8ff5bfe5f238ff0b7e06938c9985617ffa4dbb5aa941fd1b8cf970c6f622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28187 278384 bytes
font_01_sfnt_off0003baaa.bin
2531a2a43e096aa979222778e4434e412cb1fa2910dfd9cb004187d7b219ea4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BAAA 25200 bytes
font_02_sfnt_off0003ea94.bin
8b9eb2f36f6f65ca3ca102230fa21392dc3092e710378d0d8583a008361d2643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3EA94 31544 bytes
font_03_sfnt_off00042d7d.bin
9170aa21bff7f2adfedfca462d442a4228ebde1e55c59b47c3655c4c80237508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42D7D 165136 bytes
polyglot_child_pdf_off0001db02.pdf
c587cb1142782f93f96f0690e9f2098c0e3f0da65964c0163e4820603e03c832		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1DB02 183161 bytes
polyglot_child_pdf_off00048e8e.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x48E8E 6125 bytes

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