PDF malware analysis — malicious · 1b5f06c3d9747017

MALICIOUS

PDF

7.2 KB

MD5: 4f3f148b0116396fe1a112692fb90ac9 SHA-1: dbd3376c783aa9fcd8dc8b1b8001a231298a1925 SHA-256: 1b5f06c3d9747017dea720d0cb5b7a381b06fda40cfe8a3917033ec991d4249d

266 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659). The extracted JavaScript stream, identified as 'legacy_pdfkit_stage_000.js', was detected by ClamAV as 'Js.Exploit.Shellcode-18'. This indicates the script is designed to download and execute a malicious payload. The obfuscated nature of the script and the use of multiple exploit techniques suggest a sophisticated attack.

Heuristics 8

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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)
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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0039_000.js` `29cd9532c372cf2216685d2f5d0278045de6b0fd3181f879258b30d35fa32038`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	27255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `7b037fa54190e770de0dcf95257be25307cfa7f02f349897a3cc5594440f0b09`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5326 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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