Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e86d62d0ba7f8f…

MALICIOUS

PDF

197.0 KB Created: 2010-03-26 14:50:27 Authoring application: Neevia Document Converter 4.9.8
MD5: b2980a85acaffb7b70756db2562cee9d SHA-1: b19acd39fc9055d6a691b4c08d51d026f4b7b5cd SHA-256: e9e86d62d0ba7f8fec286af0fcc97a60f3111ca8456a7908848c74e066bfcfb8
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated using unescape() calls, a common technique for hiding malicious code. The critical heuristic CVE_2009_4324 indicates a specific exploit targeting Adobe Reader's media.newPlayer functionality. This exploit likely leads to the execution of the embedded JavaScript, which in turn is expected to download and execute a secondary payload. The presence of a polyglot child PDF further suggests a multi-stage attack.

Heuristics 7

  • 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. (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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
ec2119df85e590d390c6b4323644e3f0acd58e50313801d0b5eb1957b7e45332		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2660 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).
stream_024_off00019f20.bin
da9bbac700cd6c4a617908f07d6a19e6f6ba4b1d60111e64ec3f01df4eedb640		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19F20 50240 bytes
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
font_00_sfnt_off00013cba.bin
36b0d0f1c9656437f70811a25e668e3d019dd24a22d99ed593f2824909ae66de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 30188 bytes
font_01_sfnt_off00018ccc.bin
381a0432d5d353c86cb75a1b12e3e9585c6d170f3acf90a73f0b0282bfe50c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCC 10284 bytes
font_03_sfnt_off00022378.bin
8429ac1345deead0d05f4037f61d548f1ed75bf0043a375e99b4bc0640d0205d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22378 29584 bytes
polyglot_child_pdf_off000093fb.pdf
acf19e8b54aeb66929edafa8176490c3a7eaf6c7941272e3d4d0caddb4d1d684		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x93FB 163894 bytes
polyglot_child_pdf_off0002fc44.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2FC44 6125 bytes

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