PDF malware analysis — malicious · 518810ef089deb40

MALICIOUS

PDF

11.8 KB

MD5: 33e9f95bfefcc8e45b7930b1c46ae994 SHA-1: 19450ba613f8492796ca25a44371b0c7cbd8bb56 SHA-256: 518810ef089deb4005e19abba519e6722b885c87a66e6a3baae7c9586778d32f

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The PDF file contains embedded JavaScript, specifically triggered by the CVE-2007-5659 exploit targeting the `Collab.collectEmailInfo` method. The primary heuristic indicates a hex-decoded JavaScript stager is recovered from the annotation subject. This stager is responsible for decoding and executing further obfuscated JavaScript, likely to download and run a second-stage payload. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-36165 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36165
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` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
`annotation_subject_callee_hex_stage_000.js` `79a03f4729138b1c8b4c63dc748784cb290da6028ee297eb0864af7dd447e7d2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5050 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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