Malicious PDF — malware analysis report

Static analysis result for SHA-256 db48b5d77533ead5…

MALICIOUS

PDF

147.0 KB Created: 2010-03-10 10:01:17 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Bullzip PDF Printer / www.bullzip.com / Freeware Edition (not registered))
MD5: 7e8bc95b4b0fb4bc1d7ca5cd64034dea SHA-1: 2708dd54d19afd9f63fdac9babdfb37cff408864 SHA-256: db48b5d77533ead56bdd5d9e119ede45c639196d3b8bfce5b8b1b3808dde61e0
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324. This exploit is designed to download and execute a secondary payload, indicated by the 'media.newPlayer' sink and the presence of obfuscated JavaScript streams. The polyglot nature of the file, containing a secondary PDF, further suggests a multi-stage attack. No specific family could be identified, but the exploit and delivery mechanism are clear.

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/
    • http://ns.adobe.com/iX/1.0/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
42f03bc035850154aaae34acc56e54ab9521b8e62ae89a4238dbadb624bb463b		 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).
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_off0000dc9b.bin
51f1bd9423cd723c587f4887ef911151884a1423f8e3bf9ae43ee102ccdfcea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 84540 bytes
font_01_sfnt_off00011260.bin
a97d64349b56d2c01120369604811641de9dce8f8e05f66405c4497078681ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 204632 bytes
polyglot_child_pdf_off000093ff.pdf
0f4306b08adaa07392eca5b3b185180295b24ad049baeee12f122f47dffabe3a		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x93FF 112621 bytes
polyglot_child_pdf_off000233ff.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x233FF 6125 bytes

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