PDF malware analysis — malicious · c8459a8bf050a704

MALICIOUS

PDF

11.8 KB

MD5: 44bb33b9ad721c81aa5870c92c2c17a3 SHA-1: 7f39a6599f32edb4a54d27bdc98291d86e2f1cf6 SHA-256: c8459a8bf050a70419cd884b8641d850f8bb29006b87b10c43541a1ef668cc86

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. A critical heuristic, CVE_2007_5659, indicates the use of the Collab.collectEmailInfo method to exploit a vulnerability, likely to execute a stager. This stager, found in annotation_subject_callee_hex_stage_000.js, is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of obfuscated JavaScript and the exploitation of a known PDF vulnerability strongly suggest a malicious intent, likely for further system compromise.

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.
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.
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_obj0007_000.js` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `eada73923ae80be24fbeefb4cfaef1a9a669da95ea375b1fc795302accda97f2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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