PDF malware analysis — malicious · fd425d1b0e844f6d

MALICIOUS

PDF

11.9 KB

MD5: 9c91636f0c9e9f6cdcda96532352c5be SHA-1: a76c45de2dc5480c1f65f2d65a10d569b0631ab0 SHA-256: fd425d1b0e844f6d2f1b0a9f1358e6c3a50fef52748536d77b0f277d86f86fb8

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the Collab.collectEmailInfo function. This JavaScript is heavily obfuscated but appears to be a stager designed to download and execute further malicious content. The ClamAV detection of 'Pdf.Exploit.Agent-36063' further confirms its malicious nature. The primary attack vector is the exploitation of a PDF reader vulnerability to run this script.

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.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `cd06ab1b250ebd43d7c68c6ec8e28d8c1ec97a4c3e7a3df5ee400559aa6283ba`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5063 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` `62221f7b0fd64e4e50635b7235b81c7a5bf742de8a9b642ff124ece9ca373905`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12041 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` `a4a3d8f74f9fb92c934e1f051bd4e084e46b2c94415fb5f89a30187bb7709aeb`	deobfuscated-js	PDF JavaScript deobfuscation pass	76570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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