PDF malware analysis — malicious · 1fbffa149d19336a

MALICIOUS

PDF

11.9 KB

MD5: b83fc2cf08e80e9b1ecadc19c759aa1e SHA-1: 0abab1588f645432abb77d04eb0a076dc8c835e9 SHA-256: 1fbffa149d19336a65c42261f5186b3f6d42f944bdc663e55cf0f9a512f11b4d

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to Collab.collectEmailInfo. The primary JavaScript payload is heavily obfuscated, but analysis indicates it decodes and executes a secondary, larger JavaScript stage. This secondary stage is responsible for the malicious activity, likely downloading and executing further payloads. The presence of obfuscated JavaScript and the exploitation of a known PDF vulnerability point to a downloader or dropper.

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` `417d703e69676bc8320bc93b4a127cd2484fdad3999de8854d0e52a696326a40`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5335 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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