PDF malware analysis — malicious · 9fb565d8a0a3c79b

MALICIOUS

PDF

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

MD5: 43972599b9f8662e9dc461d143405b49 SHA-1: 6b0f747591686e7f8e99a7a8a35db625b048499b SHA-256: 9fb565d8a0a3c79b04e798b98022c15fa15dc14953d7412ff623f03ca8d7f4a2

318 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 leveraged to execute embedded JavaScript. ClamAV detections further confirm its malicious nature as Pdf.Dropper.Agent-1828854. The embedded JavaScript, particularly the deobfuscated legacy_pdfkit_stage_000.js, is highly suspicious and likely responsible for downloading and executing a secondary payload, a common dropper behavior.

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: Pdf.Dropper.Agent-1828854 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828854
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` `6fb1bf7d839d9d6e651c14da43d2d412f84d91da7c28b958cb7e28e7f726479c`	pdf-javascript-stream	PDF /JS object 12 at offset 0x4F7	922 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0028_001.js` `e2387350cdd1eef4ff4e1579ee8f7ec863b284c6fcabde838e9ca5dab81e5ae0`	pdf-javascript-stream	PDF /JS object 28 at offset 0x1B9	1837 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` `b03a55d1305a58eda6f7a9230249328dae5c4aa3246412c932cc76cad72f30d5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x786	36195 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 147 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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