PDF malware analysis — malicious · 075af21dd44fce89

MALICIOUS

PDF

8.4 KB

MD5: 74da540b6ef7ce8a2a95c51e01405d1b SHA-1: 195c403d1e182af8ed9e8d2fe51b7cf2eacda685 SHA-256: 075af21dd44fce89ea239f650c43e26445844c8351ebf74ee658a9245e7ac6b7

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability. This JavaScript is designed to download and execute a second-stage payload, as indicated by the critical heuristic firing and the presence of deobfuscated JavaScript code. The ML classifier strongly supports the malicious nature of this file.

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` `83d868ca09aae4e93f83190f30250d23441e6eae8675885e181b362c864a4449`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	36 bytes
`javascript_obj0013_001.js` `3586c1fe8fd3e6df77cd5d9d519cdcf4b93246dbd8a9bfa5c67b2d19cd6ae635`	pdf-javascript-stream	PDF /JS object 13 at offset 0x35F	16076 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `f389225a7e6c4713bb3d0abd0b4126e4db3671b0b9e709d53de3aead3bad1f5b`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x35F	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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