PDF malware analysis — malicious · add276abbedcbb0b

MALICIOUS

PDF

76.3 KB Created: 2009-12-05 19:43:31 Authoring application: PDF Library 9.8.6 (via PDF Library 9.1.10)

MD5: 99d316643d5b79061f645fee6597c63c SHA-1: 6ad9d62216b9db56a0c896a61d85c35578945dd1 SHA-256: add276abbedcbb0bf1cc2aea751f0035cae4b12aa8e5df92a94fce1b7f39ee44

278 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF exploits multiple known vulnerabilities in Adobe Acrobat, specifically targeting Collab.getIcon, Collab.collectEmailInfo, and util.printf functions. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated and likely responsible for downloading and executing a second-stage payload, as indicated by ClamAV detection (Js.Exploit.Shellcode-18). The exploit leverages specific CVEs to achieve code execution.

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` `fcd3a88390a3a27ed7f3b39d5e26e4d7735d612e22946bece5dd3eb0fe31e42b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38568 bytes
`legacy_pdfkit_stage_000.js` `271710234cdce4d3113df4901be98993f97acfb43ef315937365743e6e6701d1`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10114 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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