PDF malware analysis — malicious · 3f7143a6ce5c6204

MALICIOUS

PDF

11.8 KB

MD5: 3ffec26e815320f9b6ff2c74b1e12a37 SHA-1: 767d62db7668ef5f8fb755f5a59eb21f09bf5b4b SHA-256: 3f7143a6ce5c6204b5c2c0208d94573f9f8b7a5dfca076cb0cad7d93da64cdf6

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'CVE_2007_5659' heuristic specifically indicates the exploitation of a vulnerability related to 'Collab.collectEmailInfo' within the PDF structure. This vulnerability is used to decode and execute a hex-encoded JavaScript stager. The stager is responsible for downloading and executing a second-stage payload, as indicated by the 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' heuristic. The presence of obfuscated JavaScript and the exploitation of a known CVE point to a malicious downloader.

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` `53980bf62c149f82698c96a3d6f29ae5e61c5b0ab6a86994e8890b9f2389e07a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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