PDF malware analysis — malicious · 4b136d3fb38e123b

MALICIOUS

PDF

75.9 KB Created: 2010-01-04 19:41:81 Authoring application: PDF Library 5.8.7 (via PDF Library 7.8.7)

MD5: 51e8a25f3480f6a1d6732c53f1c16e3d SHA-1: 194f5a2170b763ae971daaa427ca158d50d986c5 SHA-256: 4b136d3fb38e123be80bfa56cbe3100d889442ccb7a289cfe01ef446911c98af

338 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1059.007 JavaScript

This PDF file exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by leveraging embedded JavaScript. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated but static analysis indicates it is designed to download and execute a second-stage payload. ClamAV detections further confirm the malicious nature of the file and its extracted artifacts.

Heuristics 9

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: Pdf.Exploit.Agent-36110 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
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` `8e13ff4b97636c08a42a87817ee706521d092f7813b47049a5a91c5e7c66a430`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38340 bytes
`legacy_pdfkit_stage_000.js` `fc5857e9e4003f211528d2aa7b6213c5dbe2b2605214f769dc889e37b0a7db06`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10018 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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