PDF malware analysis — malicious · 9166d4166fb3ad6a

MALICIOUS

PDF

3.9 KB

MD5: 42a101945740487bfebd2f4faa9c76dd SHA-1: 55250a0adf10c5986063001e3854f1e8986687d0 SHA-256: 9166d4166fb3ad6a1850601c2e92d302a6c774e70dbd16bca63fd6e8bbbfe4a9

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicative of obfuscation. The critical CVE-2009-0927 heuristic firing points to the exploitation of a known vulnerability via the Collab.getIcon method. This JavaScript is designed to download and execute a secondary payload, as evidenced by the extracted JavaScript files and the overall malicious verdict. The specific exploit mechanism is the use of a numeric character-code string decoded JavaScript.

Heuristics 7

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
Additional-actions dictionary medium PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `508f3b589a03ad0faa9ae4e8ba08f8caab85ad759dc296ae45a1d98f2e22a4ed`	pdf-javascript-stream	PDF /JS object 5 at offset 0x132	20465 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `d63457a1d6836b92b4f30307bc476680e856d728cbe1a949cb574855fee2204e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x140	6016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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