Malicious PDF — malware analysis report

Static analysis result for SHA-256 248625684e1537a5…

MALICIOUS

PDF

46.6 KB Created: 2010-06-07 21:36:36 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: cba65239595870068daa76e03b9967c0 SHA-1: 2bb140254973ff523ec2ead16a572d07995a1fda SHA-256: 248625684e1537a53bc8cd199031b56382101818e35a5893e490e5cee18b3abc
256 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, as indicated by the 'CVE_2009_4324' heuristic. The 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature as a dropper. The embedded JavaScript is obfuscated but appears to be designed to download and execute a secondary payload, which is a common dropper behavior.

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.
  • ClamAV: Pdf.Dropper.Agent-7239988-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7239988-0
  • 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 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000329.js
dc25799188804395728ff5ce9b7759b2df7bc5814f924f93f545e2b1144a50bc		 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
polyglot_child_pdf_off00008ded.pdf
f92897f610a2e2c8c170a1a6868d9f7f74cedf31329c9fa13e1a46d636651ad7		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x8DED 11364 bytes
polyglot_child_pdf_off0000a264.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA264 6125 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.