PDF malware analysis — malicious · 256bca865ece8d5e

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 02:25:45 +08:00

MD5: 8f126a117f10a52519cceace3ca97b73 SHA-1: 1ca0a9217223b2db39c82d5f1396a11b4d267177 SHA-256: 256bca865ece8d5e13387318a7d01625911910912d76beba2fb3da1f450f80cb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation. The critical CVE-2009-4324 heuristic firing suggests the exploitation of a vulnerability related to media player functionality. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. No specific malware family could be confidently identified.

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. (matched in decompressed stream)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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)
Suspicious extracted artifact info 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.
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_011_off000009f5.js` `3a24e5afb870540b5c79fa30de554d843ae6b6d7ca54f2d0f972aa1eab69f638`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x9F5	2496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_018_off0012a6c4.js` `b827037233eb39623a589dc396c4a1728786214e16539d3395e287ce621f5cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12A6C4	2371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`objstm_0020_00.bin` `defa5d1fbde43e3e5af341d83f04286b6b1132f89222a3a288927684d318cde8`	pdf-objstm-decoded	PDF /ObjStm 20 0 obj (inflated)	586 bytes
`objstm_0039_00.bin` `52910db49ded8dd82ccdccbf7059fa55f3e80a0b127a3f17091607db7a9d15e2`	pdf-objstm-decoded	PDF /ObjStm 39 0 obj (inflated)	32 bytes

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