PDF malware analysis — malicious · 83839fd4182f0cec

MALICIOUS

PDF

4.9 KB Created: 2010-03-02 02:08:27 Authoring application: zw80111

MD5: f4994923eb9f03bba1fb49ce3d915e8a SHA-1: 0b0f5bbce1e44344ad3633d8172d1c599f09ac91 SHA-256: 83839fd4182f0cec772f3d46b073362e4e85b839b16701d704bdb7cc14139290

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that triggers multiple critical vulnerabilities including CVE_2009_4324, CVE_2009_0927, and CVE_2007_5659. Static triage identified obfuscated JavaScript and a long encoded blob, further indicating malicious intent. ClamAV detected 'Js.Exploit.Shellcode-18' in an extracted artifact, suggesting 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_obj0028_000.js` `a71bdadb228f3832f18d8335ad6c1979dcf2d3b1d6a013acbfdc40c9b6d456c8`	pdf-javascript-stream	PDF /JS object 28 at offset 0xFFB	360 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` `02489cb4e620c349864c4ed11de11deda3c8beac4cf2ac7f0b5b659a29d87dca`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1EC	7055 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 14 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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