PDF malware analysis — malicious · 94b2516c3f47ff15

MALICIOUS

PDF

9.7 KB

MD5: f52a787ee919087bbc272e4bbcdce53a SHA-1: 16e9b5769d982b3f6bc7636e10eb74f79a5c1376 SHA-256: 94b2516c3f47ff15c0da0b08e309cf638e932fb499cc1208b24bf044f433e476

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and a JavaScript stager mechanism. The primary function appears to be downloading and executing a second-stage payload, as suggested by the large deobfuscated JavaScript files and the ClamAV detection name 'Pdf.Dropper.Agent-7283990-0'. No specific family could be confidently identified.

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-7283990-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283990-0
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` `311148028e03fdf6311acdf96781e5fd4537017dc2616cb09ffc3de4bc85650e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5257 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` `431d43f4ec5fd503fa749b4cc59b9d7b47dd2fe18023c6b3770a92a968331e7e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12471 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` `66a833a196cdc628c76b8f38c31d4c818c7309a317bb86e1e7211b5668db860a`	deobfuscated-js	PDF JavaScript deobfuscation pass	47348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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