PDF malware analysis — malicious · 4b2c135f508bbfd9

MALICIOUS

PDF

11.6 KB

MD5: b657d525fa58263ad698f178194d8a94 SHA-1: 5dfaa36b6672c4208660ce9476e5fa7e19e3affe SHA-256: 4b2c135f508bbfd9c842c4e9922392dde6d74e40a6a12a7555eaf71e57b7b303

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability, specifically using the 'Collab.collectEmailInfo' method. This JavaScript is designed to download and execute a secondary payload, as indicated by the extracted JavaScript files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The primary function of this exploit is to act as a downloader for further malicious activity.

Heuristics 5

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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.
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `f3c6a40e4e78b7c3d51131df403b21645dddc5ca408c6d0d2a19a62ded804452`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11895 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `04fd01fec8169acf6d9f4b5c147d498b0a88d1c90cd75f0f7a43885f47fc1667`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4946 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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