Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b182f64a8b04b3f…

MALICIOUS

PDF

216.2 KB Created: 2010-06-08 11:52:50 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 100cf902ac31766f7d8a521eeb6f8d68 SHA-1: 6e73aa10ad8b117799aad005e5e413e5a4f90d40 SHA-256: 6b182f64a8b04b3f0c287e29ccb8bacf66cc59b8be5756cf7fb968455fc78d6f
350 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer API. This exploit is designed to download and execute a secondary payload. The presence of multiple heuristic firings, including ClamAV detection and ML classification, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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.
  • ClamAV: Pdf.Exploit.Agent-30079 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30079
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000329.js
adf24d2f9388c47a1edc410bd21a0ac705271d8b5d9de7bea9f3d5a69ac2965f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 2684 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_off00019290.bin
f7a9ec95c838495f4cc6573c5e257ef1d043c05a02a21ce0bfb512f739657946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19290 110880 bytes
font_01_sfnt_off00028a05.bin
4b6d7e76882f7bb2c4dbb92fda6b1626cda5be5195b6899a0cb5b6ea89e20ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28A05 86132 bytes
polyglot_child_pdf_off00008ded.pdf
10be1f5ef20d5dd989ffab6452c24d9e82f0659049adad543fd668f4cc90b025		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x8DED 185012 bytes
polyglot_child_pdf_off000348b4.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x348B4 6125 bytes

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