PDF malware analysis — malicious · a41df777aa82b3b7

MALICIOUS

PDF

12.1 KB Created: 2009-11-23 19:42:08 Authoring application: PDF Library 9.6.2 (via PDF Library 10.2.7)

MD5: 6e44b654a393eeec513d900359d0239a SHA-1: 21e3a351b25f082fbe34d0810c07155e8a6bfb25 SHA-256: a41df777aa82b3b7c3debb5f596e9307d26db2cbe0481dc31fbd6bfa493c69ce

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits multiple critical vulnerabilities in Adobe Acrobat (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The deobfuscated JavaScript, identified as legacy_pdfkit_stage_000.js, is indicative of an exploit kit attempting to download and execute a secondary payload, as suggested by the ClamAV detection 'Js.Exploit.Shellcode-18'. The file's structure and exploit indicators strongly suggest a malicious intent to compromise the user's system.

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` `7e5d813204a1f187142b26b48a67cdcf80da949c0b85e36695e0d8f70ac13925`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37482 bytes
`legacy_pdfkit_stage_000.js` `ab95cde47f400df700213a842ffc58067607f8a124e5cbe2e8cb8d97291b2229`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9880 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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