PDF / .TXT malware analysis — malicious · aaaf45add4b3a0ec

MALICIOUS

PDF / .TXT

7.4 KB

MD5: cb00d4964ea02b496be6ffcec8bf21de SHA-1: f46d4bf0366694d985feb1e24c190180c7d6e801 SHA-256: aaaf45add4b3a0ec70efd4017568bed43c31d9eaf77303fcfe94e0b194132f79

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 deobfuscated JavaScript streams indicate that the primary function is to download and execute a second-stage payload, as evidenced by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The attack pattern is consistent with a PDF-based exploit dropper.

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` `49c6c0874d3f865d02f7e0ae1ccfe8de84d1bbda2b53c0bc0343e52a49764f13`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	28172 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` `927c28668b447cc3a2f37d67eef971430130cdcf0981f73a0efd2674709d0df5`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5506 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` `ed59e7c1db405d10c555f549d378fa0299627dc20ee72dc034fd32d522973da0`	deobfuscated-js	numPages XOR decoded JavaScript at offset 0x16F	5506 bytes

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