PDF malware analysis — malicious · c619e20cfd60b9ef

MALICIOUS

PDF

77.3 KB Created: 2009-11-28 19:49:99 Authoring application: PDF Library 3.6.9 (via PDF Library 9.4.3)

MD5: 0aa10d3de2e314bd00582d04c265c5b3 SHA-1: 0bca7094da3b7a17436c1e522d28110fc9875f00 SHA-256: c619e20cfd60b9ef5b69d88b43d944ae26d361a7394209679c0ed654ee2945bb

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

This PDF file exploits multiple known Adobe Acrobat vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits are triggered by embedded JavaScript, which is heavily obfuscated and decoded using ASCIIHexDecode and other filters. The primary purpose appears to be the execution of a second-stage payload, as indicated by the ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted JavaScript artifact.

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` `857b45f626633009de55ecd308af6db699ff40535f1221a91c9412eae5afbccd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	39086 bytes
`legacy_pdfkit_stage_000.js` `1030d74d83d2a3708996607fd6dfe9e1e9ea4f55cc86cacec76fb3816c95a864`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10108 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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