PDF malware analysis — malicious · 4a3bef3439da86d6

MALICIOUS

PDF

4.9 KB Created: 2010-02-12 07:43:02 Authoring application: y25801b752d6dd

MD5: 7d65e35bd1c070d14b27115516d1e794 SHA-1: c4ee6ecd82264f718598bba245cfb426c4de6423 SHA-256: 4a3bef3439da86d635100f5a121d83753d948273cab0bbb63497c1b1ad82dd68

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) via the media.newPlayer, Collab.getIcon, and Collab.collectEmailInfo functions. Static triage identified a suspicious extracted artifact named 'legacy_pdfkit_stage_000.js', which was also flagged by ClamAV with the signature 'Js.Exploit.Shellcode-18'. This indicates the script is designed to download and execute a second-stage 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_obj0004_000.js` `4e231d06dc7374935afd452fcb1a5ce277f416f355d0c65276bb195bd42be6c7`	pdf-javascript-stream	PDF /JS object 4 at offset 0x101C	653 bytes
`legacy_pdfkit_stage_000.js` `079a73e2adc7711439d53dd2a68d734e5f0f08cd4e693fbdc2251df7cb2c209c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5750 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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