PDF malware analysis — malicious · 9cbfd79efe8a0bc2

MALICIOUS

PDF

9.6 KB

MD5: 8bea5ac933e43da6666d10b9d325cff8 SHA-1: ba0afbb41002b0207b9fc8034bcfe5b6023dbc48 SHA-256: 9cbfd79efe8a0bc2969b88b2c6f0473c99e94be02994bee0472a23a2dc0db8b1

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified by the 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER' and 'CVE_2007_5659' heuristics. This JavaScript is designed to be executed via the 'Collab.collectEmailInfo' method, exploiting a known vulnerability. The primary function of the embedded script appears to be downloading and executing a second-stage payload, though the exact nature of the payload is not discernible from the provided evidence. The 'CLAMAV_DETECTION: Heuristics.PDF.ObfuscatedNameObject' heuristic further confirms the malicious nature of the file.

Heuristics 7

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `f5e08eac5d51bc63766fde73e36d3e9b27d273914391c0e3e691c450edc44c77`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5221 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `a39f5f3788121e4b1ef9c7133aec9a72b378ef6e16bd9d37bfa1d943497c3776`	deobfuscated-js	PDF JavaScript deobfuscation pass	73152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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