PDF malware analysis — malicious · e0904dda51576992

MALICIOUS

PDF

7.9 KB

MD5: b8ce769c802f02d8e0833786a62755d2 SHA-1: b92c7c416e8120c3c2233daedbe0101d72195d97 SHA-256: e0904dda51576992b7e21488cb70438dbee8ff6c8c6dfee54b3e65d3ea1bf76d

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2007-5659 trigger. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', likely downloads and executes a second-stage payload. The ML classifier strongly indicates malicious intent. The specific CVE exploited suggests a targeted attack aimed at older, unpatched Adobe Reader installations.

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` `de842158aa568d1c40ba88d734da5ad901cc1f40bb9ebe50d141a0ecd8bdeeed`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	55 bytes
`javascript_obj0013_001.js` `197b13231c94d6d0b70e88d3af5a4200f5c4c63b24e4534b588dc2418b75c5ee`	pdf-javascript-stream	PDF /JS object 13 at offset 0x385	15291 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `860b37ae8f185a66cc6b6be9f8f5df35aa0e59b0c0c10ecc1769ff66b0de25d3`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x385	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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