PDF malware analysis — malicious · d9c41960050dafcb

MALICIOUS

PDF

11.4 KB

MD5: 913976ffec6f6e494f0ed2d7b59122c8 SHA-1: b897db607dc7aae6bcef44e0a454c64d44607796 SHA-256: d9c41960050dafcb50037985cd398cb220e9273701a09c599129aefb280b4fec

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically a stager triggered by the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. The annotation subject is used to obfuscate and deliver this JavaScript payload. The recovered JavaScript is heavily obfuscated, but the primary intent appears to be the execution of a secondary-stage payload. The exploit targets a known vulnerability in Adobe Reader.

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` `84bb8b136ff40cc9260469b147648553d8750b1b7463e73614975183ae84dc57`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5125 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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