PDF malware analysis — malicious · 1b503bcd1555eac2

MALICIOUS

PDF

12.2 KB Created: 2009-11-23 19:41:98 Authoring application: PDF Library 7.10.6 (via PDF Library 2.4.9)

MD5: 3db5b44df416d817cc73971893f8ff9f SHA-1: 2f0bded311115563e78ec7d6d81fb2424f6a07bc SHA-256: 1b503bcd1555eac2a7ef4f3a0a625c7084a89c89381618dd74111099b2323613

278 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Document T1059.007 Command and Scripting Interpreter: JavaScript

The PDF exploits multiple critical vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, indicating a malicious document designed to compromise the user's system. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', likely downloads and executes a second-stage payload, as suggested by the ClamAV detection 'Js.Exploit.Shellcode-18'. The use of multiple exploit triggers points to a sophisticated attack.

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` `80009164bc424aaa510c4c20241460df615dcf0f935a560513cb39c50a7a11c7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38141 bytes
`legacy_pdfkit_stage_000.js` `673e076ee84d8bea0a8c73d167b23d42da423854746eb06387e0735e32a17740`	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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