PDF malware analysis — malicious · 9333cbdb03d48916

MALICIOUS

PDF

77.1 KB Created: 2009-12-01 19:43:04 Authoring application: PDF Library 2.9.5 (via PDF Library 2.4.8)

MD5: ec833e5b7708e3dd4c0440e2c5588740 SHA-1: 55d0095b6147f774d0fa620db18274ae7dc74d08 SHA-256: 9333cbdb03d4891694523a6f19b9b6530a1529e93ff0653bf3e0c398ab4b6c37

338 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059.007 JavaScript

This PDF file exploits multiple known Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, through embedded JavaScript. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is responsible for executing the exploit payload. ClamAV detections further confirm its malicious nature, flagging it as Pdf.Exploit.Agent-36110 and an extracted artifact as Js.Exploit.Shellcode-18. The primary attack vector involves tricking the user into opening a malicious PDF that leverages these vulnerabilities.

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` `a22504fdd9b728a3be02b18b366ecbfb291db9c5a45e858f7a4a51a4b5bf667d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38975 bytes
`legacy_pdfkit_stage_000.js` `2978912c3f09668f10f0eee776a1b8bacb260f77e4956c8d316e6816d9b00bed`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10102 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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