PDF malware analysis — malicious · aececfd4e9e2d107

MALICIOUS

PDF

8.4 KB

MD5: 184586298bb876066b4d617df237f8c7 SHA-1: cd9f27d6e7d9bc3313a2dae95520a0eecbfc3d67 SHA-256: aececfd4e9e2d10775578a6388221d95328b1f3e46128cfdd30eeb71a694da77

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

This PDF file contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2007-5659 detection related to the 'Collab.collectEmailInfo' function. The ML classifier also strongly indicated maliciousness. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely serves to download and execute a second-stage payload, exploiting the identified vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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_obj0001_000.js` `f3f576336762c2ff94f3ae85bf543c03655e570933be64303b98a3dfddffe4f0`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	34 bytes
`javascript_obj0013_001.js` `662472565f0c2fd3b707f86109ff3837d0405d730be191f0a5740cacf4021323`	pdf-javascript-stream	PDF /JS object 13 at offset 0x35B	17985 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `20ec0a2411aabbb562a2347cd314855b4dbdfb722ceb7b4e7f4e897267e3c6ab`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x35B	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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