PDF malware analysis — malicious · b1ffd01f8cc820d9

MALICIOUS

PDF

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

MD5: d5ab0dd57b1b4546ea5e9e989aebd03c SHA-1: 6a92eb85e5c3af609ff9c5529201dbf7785782d8 SHA-256: b1ffd01f8cc820d9788993471e06927afc64c765e3d9d7f0932eb32273e5f37d

258 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to execute embedded JavaScript. Heuristics indicate that this JavaScript is obfuscated and has been detected by ClamAV as Js.Exploit.Shellcode-18. The embedded JavaScript is likely designed to download and execute a second-stage payload, a common technique for initial access.

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` `eaffe4108eb98d8d8c6cfe0937b0ae6f41e64473b5dba964575f0d4de16e137a`	pdf-javascript-stream	PDF /JS object 12 at offset 0x51D	879 bytes
`javascript_obj0028_001.js` `eeb96278ac09c33880af21152651a278033f8d2b6f334c160e7099b056174e51`	pdf-javascript-stream	PDF /JS object 28 at offset 0x1B9	2247 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` `55e99e143ca870de8342228be08b3a0fb4a7332922743dc44ebddbe16365d244`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x7A6	29532 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 61 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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