PDF malware analysis — malicious · e5fbf51e0cc215ac

MALICIOUS

PDF

9.5 KB

MD5: 08993a602947637c5daa538999d5d854 SHA-1: 6a70900719c3b6723f6af1af68a21fa6a41a3864 SHA-256: e5fbf51e0cc215acf0e31505eee63cdfee3468a42adc29806361abf17ed9617e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF leverages the CVE-2007-5659 vulnerability, specifically the Collab.collectEmailInfo method, to execute obfuscated JavaScript. This JavaScript acts as a stager, decoding and executing further malicious code. The ClamAV detection 'Pdf.Dropper.Agent-7317167-0' confirms its malicious nature as a dropper. The extensive deobfuscated JavaScript suggests a complex multi-stage payload delivery mechanism.

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: Pdf.Dropper.Agent-7317167-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7317167-0
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` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `b376e90f0b5bb9db35871b4856d4ab65637395009d62d841ecd83016787098ee`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5115 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` `ce957e36e4f9fe3be168a033942bbef647e3c5cca1d0f9ed28802e8b2cfd42d6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12280 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` `9d1eb4c60adc3def4dce02d2747784ef2aef9e3e9354fe3a3189264af9398729`	deobfuscated-js	PDF JavaScript deobfuscation pass	48083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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