PDF malware analysis — malicious · 51cd8b4ae63f8bb2

MALICIOUS

PDF

4.9 KB Created: 2010-03-05 10:39:52 Authoring application: zwffdce

MD5: 3fd4b5626983ea3549374c4bc8f1f108 SHA-1: f1b1d65aa227eefc4d538eff9c6d862830e64040 SHA-256: 51cd8b4ae63f8bb26cb2391065a212ff1ed58d978cbee3feabfe7411cff2126b

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. Static triage identified a suspicious extracted JavaScript file, legacy_pdfkit_stage_000.js, which ClamAV detected as Js.Exploit.Shellcode-18. This indicates the script is designed to download and execute a secondary payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0028_000.js` `12d85c788ac9843260c1e85032a39e89d4d8ddf8fcf5bc5c006e3c830fb462b5`	pdf-javascript-stream	PDF /JS object 28 at offset 0x1012	297 bytes
`legacy_pdfkit_stage_000.js` `2f40efc003e4076e3bc71f654cf8522eaac35d8ff31cf840be58d725f7bea392`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1EC	7287 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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