PDF malware analysis — malicious · 43ac1a89391fe2fa

MALICIOUS

PDF

12.4 KB Created: 2009-11-06 19:45:49 Authoring application: PDF Library 5.1.7 (via PDF Library 1.9.7)

MD5: 1e679940410e512501abc257cdfcdfe0 SHA-1: 01137a163f06d86267b6b7b89927e57798d2d883 SHA-256: 43ac1a89391fe2faa01bba3bae46b4fca6976445e5078b27611b9345ec041b0c

278 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities in Adobe Acrobat (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). Static analysis indicates that this JavaScript is designed to download and execute a second-stage payload, as evidenced by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The obfuscated nature of the JavaScript and the use of exploit-kit techniques suggest a downloader or initial access 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` `34d035eae520df0ca7bd8aeb35942132eba04bf868437bfa0f36f7b5afda2c08`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37792 bytes
`legacy_pdfkit_stage_000.js` `9caffb43d658c59df471e66796ae9a3b941312803b9ee42ab63c2977ef6eecd7`	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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