PDF malware analysis — malicious · b8d6db4754a650dd

MALICIOUS

PDF

12.3 KB Created: 2009-11-08 19:44:28 Authoring application: PDF Library 2.2.6 (via PDF Library 2.6.1)

MD5: 403bb4754ff952dc414ff746cfccd7ff SHA-1: 19a38b1be5874a8c8561e7636dc1550b9c9947a4 SHA-256: b8d6db4754a650dde438d9b312a0e6b68bb6d96c72d43241fe8bba4da3b65be0

278 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.007 Service Execution: JavaScript T1190 Exploit Public-Facing Application

The PDF file exploits several critical 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. Static triage identified a suspicious extracted artifact named 'legacy_pdfkit_stage_000.js' and ClamAV detected it as 'Js.Exploit.Shellcode-18'. The embedded JavaScript is designed to download and execute a second-stage payload, indicating a typical exploit kit delivery mechanism.

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` `d695de7bd8f3d25969f13a0b105cb19d605914a507674ecf8e3f5fe1d36558a2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37686 bytes
`legacy_pdfkit_stage_000.js` `06df43fb8673d48953533152b2fda7d24168e2d23269b58d528d0d36bc5e0663`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9868 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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