PDF malware analysis — malicious · 999b4fa66ffc2d75

MALICIOUS

PDF

12.0 KB Created: 2009-12-17 19:47:38 Authoring application: PDF Library 10.1.7 (via PDF Library 10.2.5)

MD5: 91a73026a88c0233b18a58121ee95b05 SHA-1: 5a96f9e3b87e37886ea07bc328bf5c824535f7bc SHA-256: 999b4fa66ffc2d75740ac700534d829957a7db6d7691d20df12b29f1614f7cbe

278 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF exploits multiple known Adobe Acrobat vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits are triggered by embedded JavaScript, which is further obfuscated and decoded. The embedded artifact 'legacy_pdfkit_stage_000.js' was detected by ClamAV as 'Js.Exploit.Shellcode-18', indicating it likely downloads and executes a second-stage payload. The primary attack vector is the exploitation of these client-side vulnerabilities.

Heuristics 8

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `424e5d9794a4616b902a370b81053e625c7b8dcc9e184e286be4ea0ed1cd7fed`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37721 bytes
`legacy_pdfkit_stage_000.js` `5f4da12aba6717a21ba74eec3fdb3ff546db5e045f0f3d91f3bbe524020ae628`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9880 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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