PDF malware analysis — malicious · 8dfefde809d7668c

MALICIOUS

PDF

8.7 KB Created: 2009-11-25 19:41:00 Authoring application: PDF Library 3.2.2 (via PDF Library 5.6.3)

MD5: d8040f622573447bbfd62a19071f71ed SHA-1: e38e6869439fd80ecc1ce172bd9e0eb7b1fc390c SHA-256: 8dfefde809d7668c5c746d03f74ea945dda5700bfc9ff52d25ef84219711567b

278 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exploits multiple Adobe Acrobat vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, by leveraging embedded JavaScript. The JavaScript, identified as legacy_pdfkit_stage_000.js, is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18'. The exploit chain appears to be designed to bypass initial detection through obfuscation and string substitution techniques.

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` `bd717ec6e9578a2298b00cb9e5ce2374caaddf6769afc71d397a2aa36f158df7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38128 bytes
`legacy_pdfkit_stage_000.js` `f7ae78a84ff0c37af374f86d84a5e4a12f20cf78f368d707e48bd4522a40ebc0`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9874 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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