PDF malware analysis — malicious · f70766d1bc0fe349

MALICIOUS

PDF

11.8 KB

MD5: 9e9121e70126daef248688c57e338196 SHA-1: 811b1aeb820e8aca96c24a05e4c990b1b67887b6 SHA-256: f70766d1bc0fe3498901538e36acaf612ca9f59a5a85e943327ad51ae8e374a6

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a JavaScript stager embedded within an annotation subject, which is designed to exploit CVE-2007-5659. This stager decodes a hex-encoded payload and executes it. The primary mechanism involves the 'collab.collectEmailInfo' function, a known indicator for this exploit. No specific malware family could be identified, but the technique suggests a downloader or initial access 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` `83c89bafa116d9c91eff0b9ebda502f5bf0baa04c36fa774c6ebc2756ba3479f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	585 bytes
`annotation_subject_callee_hex_stage_000.js` `293f0255b0da2049f19a97fb5e49eacb08c23c7c7d7b1c56c859c93b183e19df`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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