PDF malware analysis — malicious · b9de8bf05e4b27af

MALICIOUS

PDF

19.0 KB Created: 2010-01-01 07:27:45 Authoring application: Fexaxououazobb

MD5: 8c0bba03d2b781fd2aae51da6445b44d SHA-1: 5aa03ad41c3c5a7f1f5fa58d4f74ed5967fc0505 SHA-256: b9de8bf05e4b27af1951fa973f05e80907bef655b7c01c4c310972d3e054aa2e

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are used to execute embedded JavaScript. Analysis of the extracted JavaScript, specifically 'legacy_pdfkit_stage_000.js', reveals it is heavily obfuscated but detected by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it attempts to download and execute a secondary payload. The presence of multiple JavaScript streams and the exploitation of known PDF vulnerabilities strongly indicate a malicious document designed for payload delivery.

Heuristics 7

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.
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_obj0012_000.js` `6a65223c326e09218ec6f554e7f50803a85fee546ee678e633621af6976d0d83`	pdf-javascript-stream	PDF /JS object 12 at offset 0x43D	1388 bytes
`javascript_obj0028_001.js` `0238b1c0a8ef8cb65b2e881d3d23a58fa535c913c3d855c33bd69f504f5c59f3`	pdf-javascript-stream	PDF /JS object 28 at offset 0x1B9	1265 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0ceeaa35c6054a50ee5c4f2bf6ef3c103bb9bb8878dda9321c70c61d8aac0385`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x766	34817 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 95 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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