Malicious PDF — malware analysis report

Static analysis result for SHA-256 254a8c9767b08024…

MALICIOUS

PDF

196.9 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 654d836a15366f77d5f4cebec1fc6c89 SHA-1: cc4cf8ba3b77c13f54a87cc902632e404165132f SHA-256: 254a8c9767b080248ed38a028e8b4a8d233378397fcba4c7f7b0bced9fc013c6
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer) to execute arbitrary code. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload from the URL http://www.fineprint.cn. The presence of a secondary embedded PDF also suggests a multi-stage attack.

Heuristics 8

  • 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.
  • 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
  • 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.fineprint.cn
    • 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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
792c8c1938cb2b44becb3ad046f87e2cb3e3ab61794e67092826b42a83680b69		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 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_off0000a41d.bin
038d356934d5a6fec68f65a4a05cce0394de9160370f833cbd0c630fbd361b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41D 73672 bytes
font_01_sfnt_off00013a8f.bin
fac6f6d8da56d73ab4dde3477963572f175252a848135dc7b2f6a74df5ba5e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 73116 bytes
font_02_sfnt_off0001ce4f.bin
1d1051d480e84e0e8b81fdaa105223a8a12242575fe2c144ba4e283d0b8a6111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4F 73996 bytes
font_03_sfnt_off0002633e.bin
4396ee103dd65db6a0c17c20f49da9a77e4b1ae8043eefa537ec8e9389cf908a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2633E 67088 bytes
font_04_sfnt_off0002eb99.bin
da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB99 3200 bytes
polyglot_child_pdf_off00006126.pdf
dc848b33fb4e689d670a467d8f432b1290b773933787ee64f89ed75375ab9bb6		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6126 176792 bytes
polyglot_child_pdf_off0002fbd1.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2FBD1 6125 bytes

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