PDF malware analysis — malicious · aabb9e79d317dee6

MALICIOUS

PDF

209.3 KB Created: 2010-03-31 21:09:20 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: 3dfe4993d61050339285b169cf82a23e SHA-1: c7bfad66f556a27c27c9462a3f12a14021402262 SHA-256: aabb9e79d317dee6f943d84e1b101865ee93a5dfc69b431a60c4ac00e3a2fae2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicating malicious intent. The critical heuristic firing for CVE-2009-4324 confirms the exploitation of a known PDF reader vulnerability. The presence of a secondary embedded PDF further suggests a multi-stage attack. The script likely downloads and executes a second-stage payload, leveraging the identified CVE.

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 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000063a.js` `9c9c46d78e21f360b755c28d6a9ee659a577bc02154d87069f4010783edd6967`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x63A	2609 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_off0000b183.bin` `732e36778e9e838aeb4d294411f027332ee836ff973afb4a8be08ab771c33083`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB183	179692 bytes
`font_01_sfnt_off0000fcb8.bin` `dbc07b66ef62b2a46597d3d7448a24e9e35a1c035afaa741daa0defc5401a514`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCB8	21900 bytes
`font_02_sfnt_off000139fc.bin` `17bc0198ba51a2120a602916e3ee939356f3676ce4b5953d0bdc426a317487f5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139FC	384484 bytes
`font_03_sfnt_off000204eb.bin` `0db8957f816972d8dae5c84e8d4d96fc7369406305c904eb2c6b8b730aaf2549`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x204EB	23092 bytes
`font_04_sfnt_off00022d79.bin` `be1120e34183dcb27dd748ac98438fab02ff198563b1585e9d7a370f3d2a35c1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22D79	13960 bytes
`font_05_sfnt_off00024ce3.bin` `da94d913a0418e9d7ee43eaf64c04fae9877e78cd2b4f160cd9ad7ffb1324f79`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x24CE3	57756 bytes
`polyglot_child_pdf_off00008dd3.pdf` `3f7794e6e1b3bc5c42b709b3c791c0999ec3761cd649d8fcbe0f4011a52872de`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x8DD3	178049 bytes
`polyglot_child_pdf_off00032d67.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x32D67	6125 bytes

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