PDF malware analysis — malicious · bfbdc3a7b622a9d2

MALICIOUS

PDF

11.5 KB

MD5: 911ac224ec3dc392bb237d7e0c8f8667 SHA-1: 6a766a91ef11d15f2f7a7cba0f7af7c2613ae902 SHA-256: bfbdc3a7b622a9d23271147a273529f4d24a046d9888ecda136d2f5cee0ee394

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1071.001 Web Protocols

The PDF file contains embedded JavaScript, identified as a stager by the 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristic. This script is designed to exploit CVE-2007-5659, leveraging the 'Collab.collectEmailInfo' method. The primary function of the script is to decode and execute a hex-encoded payload, likely for downloading and running a second-stage malicious component. The presence of obfuscated JavaScript streams and the specific exploit technique strongly indicate a malicious intent.

Heuristics 5

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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_obj0007_000.js` `e53cd3b2abe44a0ffe069bd2e56f48e1b1e8932489ba93331de44d133ee7058e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `64bc07d9911072f6e5c0799e7a438c6043e157b6c82f82d2de416c490ddd25c9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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