PDF malware analysis — malicious · 813305029f1b8033

MALICIOUS

PDF

9.0 KB Created: 2009-11-27 19:46:53 Authoring application: PDF Library 4.6.10 (via PDF Library 5.3.9)

MD5: 394a20bcd941a4bab0b0ec5f015bf8f5 SHA-1: 7596e91013decfcae38e4ebe3fecfa66adb1a50c SHA-256: 813305029f1b80333f06bcc788737112b9d8dafd2c1ed9f6d3cdb9fbb7e2e25d

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that leverages multiple critical vulnerabilities in Adobe Reader, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The deobfuscated JavaScript, identified as legacy_pdfkit_stage_000.js, likely downloads and executes a second-stage payload, as indicated by ClamAV detection 'Js.Exploit.Shellcode-18'. The attack pattern is consistent with exploit kit delivery mechanisms targeting unpatched PDF readers.

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` `349664c25d98ac6dc86c97fbf1d32dd5993546daa17af29605fc550a73aa5f38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38176 bytes
`legacy_pdfkit_stage_000.js` `4286b4467fc6dd0c2cf7a873a70b471f8010db97cc5615c1f2b7760ba6991ca0`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9868 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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