PDF malware analysis — malicious · 46cf27aa432fac9a

MALICIOUS

PDF

9.6 KB

MD5: a7a3ec05e0f9f7954900224baef4d6fc SHA-1: acabc087519afc1f0dc4c0597d5483d396066954 SHA-256: 46cf27aa432fac9aad6fa00a265c11a03761cb92435c4ed55133a35abc9481d3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded JavaScript streams and triggers heuristics related to JavaScript stagers and the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The primary attack vector appears to be the exploitation of this CVE, which allows for the execution of arbitrary JavaScript. This script is likely designed to download and execute a second-stage payload, as indicated by the presence of obfuscated JavaScript and the 'callee-key hex stager' heuristic. The ClamAV detection further supports 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 4

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` `5e39f666e1c36abccf68c5c9ca3bf78c2e7105e6215ef890ae22a871df3f339f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5202 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `32a14cd9de15a1d364251468e61c52f03a4cab50c75e2131d65971821b2ea667`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `a9a093bfa5b6c5557f94c35f81b9a94ff573c9d17d06846f446176dec13f8b03`	deobfuscated-js	PDF JavaScript deobfuscation pass	68113 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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