PDF malware analysis — malicious · 99861cb4e123134a

MALICIOUS

PDF

9.3 KB

MD5: 5403e29b0e61100dd3aea4f1429a501b SHA-1: 522b96382bc733c5156ecdce47324b5859b78be0 SHA-256: 99861cb4e123134a3e0e0d393386aa1545c848b4434af9e5c2d27a96700eab8f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains obfuscated JavaScript, identified by multiple heuristics including critical firings for CVE_2007_5659 and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER. The primary JavaScript stager, 'annotation_subject_callee_hex_stage_000.js', appears to be responsible for decoding and executing further malicious code. The large size of the 'deobfuscated.js' artifact suggests it contains the main payload, likely a downloader for a second-stage exploit or malware. The attack leverages the 'Collab.collectEmailInfo' JavaScript function within Adobe Reader to achieve initial code execution.

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` `8bd2d53ebab73037d02011d9703394ffd0a44fab1e67c84ddfeea1f1372f6b6e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `41d19e0a5397b6ee40753c829b9a49c5a0d6486eaf7d787c3beae7f84dda0885`	deobfuscated-js	PDF JavaScript deobfuscation pass	70390 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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