Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a4c67dcdc135b5…

MALICIOUS

PDF

205.5 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 7b80f7ed7052405cdf6434ff5bc7c175 SHA-1: bc1211ddc9b99b77bc7d7e132788708807810097 SHA-256: e5a4c67dcdc135b55e9bef4753c066eea5ab007641b11619cf031ce0c957021a
306 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains embedded JavaScript and a secondary PDF, indicating a multi-stage attack. The critical CVE-2009-4324 heuristic suggests exploitation of a known vulnerability in PDF readers, likely to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-30101' further confirms its malicious nature. The embedded URL, while benign, is part of the document's structure.

Heuristics 11

  • 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)
  • 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-30101 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30101
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • 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)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://paper.people.com.cn/rmrb/paperindex.htm
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
ed9369f3625f936facbf25374ffe8ac90fd83b57da7fb14dcc93f323111abdff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4264 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 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 0x392 126 bytes
objstm_0017_00.bin
dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 871 bytes
font_00_sfnt_off0001779e.bin
df3d2282e5f0b9e4a03e4e4187b97117c35603a241152ddeb6696758ec9e4090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1779E 106404 bytes
font_01_sfnt_off00026476.bin
dfccc2ae90717e5f2f133b5a41976ae6481f0f41f56ece66d6a8d76030e60eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26476 52436 bytes
font_02_sfnt_off0002c582.bin
82d893b80bac0fefbc396713a48a479132ea011c23c20359b627a8c7161a6c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C582 48092 bytes
polyglot_child_pdf_off00013e7f.pdf
be03c2ab7cc83523c46036acb1d7830e208c8142630b0b8ef39f9ab8238a0f0e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13E7F 128911 bytes
polyglot_child_pdf_off00031e21.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x31E21 6125 bytes

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