PDF malware analysis — malicious · 4c5d633578b7f773

MALICIOUS

PDF

11.7 KB

MD5: 344758f5e02b685a9c12a51eb408c1af SHA-1: 49da516d33bb50faeede0b2b5f131252113eaf4c SHA-256: 4c5d633578b7f7733acda0e028c5ccc0c3bfb69991df17b2c7be00e692b5c4b5

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. Specifically, the CVE_2007_5659 heuristic indicates the exploitation of a vulnerability related to the `Collab.collectEmailInfo` method, which is used to execute a JavaScript stager. This stager is heavily obfuscated but ultimately decodes and executes further malicious JavaScript. The presence of these JavaScript streams and the specific exploit technique strongly suggest a malicious PDF designed to deliver a second-stage payload.

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` `117e6054f1b2dea464020c27e8a78caf8ec3da9651cd2f1eb9e6ecd28fc0e100`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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