PDF malware analysis — malicious · a4118c6339a20221

MALICIOUS

PDF

4.5 KB Created: 2008-01-35 22:21:26 Authoring application: Adobe

MD5: c172a11280dd3b16b3bb497c41f4cbdd SHA-1: 4e90b131f79dbd40104eabc36de51a5cb9197da5 SHA-256: a4118c6339a202219ab2b67b73f83be0242c689c1f551b4f4352dcffc95cb4ed

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 through embedded JavaScript. The extracted artifact 'legacy_pdfkit_stage_000.js' was flagged by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it contains shellcode. The JavaScript actions and embedded streams strongly indicate the file's purpose is to download and execute a secondary malicious payload.

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
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.
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.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `8529984d11b8182d4e259231fc5dcbbacac275e9b3369ed5c8f9e5f7c154e78a`	pdf-javascript-stream	PDF /JS object 32 at offset 0x37B	340 bytes
`javascript_obj0034_001.js` `30fdf72ebd05c579570b33806e1907e3350fb3da384bc123772b95141254ed2e`	pdf-javascript-stream	PDF /JS object 34 at offset 0x1E1	253 bytes
`javascript_obj0036_002.js` `8053fffa1bb17c6cd1b988683e6e629d4636be06f782414d983e6e3ffddb8151`	pdf-javascript-stream	PDF /JS object 36 at offset 0x43	388 bytes
`javascript_obj0078_003.js` `e174ec6003c02775bffdb28669fb4e307d57a72d2604c43dbace1d4cdd6d0ee2`	pdf-javascript-stream	PDF /JS object 78 at offset 0xF42	105 bytes
`legacy_pdfkit_stage_000.js` `69bfcb2ccd6dc70f77f811451472607a14c2497da2417717e0895d6e050a3261`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x4DC	6034 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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