PDF malware analysis — malicious · 9cb1b02c36bce895

MALICIOUS

PDF

275.3 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: 376377000P000D000F000C000r000e000a000t000o000r000 000V000e000r000s000i000o000n000 0000000.0009000.0003 (via AFPL Ghostscript 8.54)

MD5: b1724934da64628e29894816f5d1a43e SHA-1: e846f5b7832e63e1c0d0f258640caec9d9a90c6c SHA-256: 9cb1b02c36bce895fb8a684f95e0f3ef0cfaa808e242a65b91a6507e41739ca9

244 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file exploits CVE-2009-4324, a vulnerability in Adobe Reader related to media player handling. The exploit is triggered by embedded JavaScript, which is obfuscated but identified as a potential second-stage downloader. The presence of a secondary embedded PDF further suggests a multi-stage attack. The primary IOC is the CVE itself, as no specific URLs or hashes were directly extracted from the obfuscated script.

Heuristics 9

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.
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)
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/iX/1.0/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000392.bin` `d83e49a77e4b0c0767e33409f7ba616668f71c161acfe607d2b14e4f9df8e093`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x392	4147 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).
`stream_024_off00038d74.bin` `f53ff7405ff89cfc49efc957386ada6c4b1ce0a5f7108f2ae4f335dbea8d065e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x38D74	13750 bytes
`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_off0003be27.bin` `ff8cede0643c6a2daa28c25cf54367ec1ef341c0d77f101ea7324d9f4f29320e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3BE27	11636 bytes
`font_01_sfnt_off0003d0c4.bin` `daae70868cd5e537f63b682955fba73987b13e54218a7cb17348fbd77a7ad246`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3D0C4	22112 bytes
`font_02_sfnt_off00040494.bin` `88fbd74dcaf0d902e165a392c3aad9f50e0e0e033ea57a384390157a8ce3fef6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x40494	13728 bytes
`polyglot_child_pdf_off0001228b.pdf` `edc2072fe99f37e242b777cdd51fce2b74269b1fbf3c6705ed56ba1a4bdf4ab4`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1228B	207511 bytes
`polyglot_child_pdf_off00043535.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x43535	6125 bytes

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