PDF malware analysis — malicious · dfd35133e6eacdd7

MALICIOUS

PDF

6.6 KB

MD5: f145dad37acb6c02f7d4912e776ac50c SHA-1: 61bbf7c3c6c297fc9a767a599b05a3f531b81183 SHA-256: dfd35133e6eacdd7e1a2519ffd16b0ad264c93fb46b82b5a2b216b04103d2018

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities, including CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The heuristics indicate that this JavaScript is XOR-decoded and executed by the PDF reader. ClamAV detected this as Js.Exploit.Shellcode-18, suggesting it's designed to download and execute a secondary payload. The specific URLs or hosts for the secondary payload were not extracted, but the exploit chain is clear.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `e9e05df20b1e5026271f7aa41a8b5493ec28231b2ddcec9eac6322951f2a7200`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	20042 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` `22c32b66bae6a090197bd744fcd5c9393fcc68e273e0d9d97ba7f0da2e9ecf75`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5398 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `3ef5f7fe46122bf998f07f49cfa377de87f8bd3c04987b36fbb097af14642fa2`	deobfuscated-js	numPages XOR decoded JavaScript at offset 0x16F	5398 bytes

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