PDF malware analysis — malicious · 2635d12db6d00ffc

MALICIOUS

PDF

123.6 KB

MD5: a4f51651bcb52bc79f60fa9e7526fe13 SHA-1: d75cb23e8f6dff882db0add23f8aec8838e66bc8 SHA-256: 2635d12db6d00ffc99d59ede080852e2d70f68542e7dfe2627870283c096196c

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file exhibits multiple high-severity heuristic firings, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE, indicating the presence of obfuscated JavaScript code. The ML classifier strongly flags this PDF as malicious (0.999916), and ClamAV also detected it as Heuristics.PDF.ObfuscatedNameObject. The embedded JavaScript artifact, javascript_obj0116_000.js, likely contains code designed to download and execute a secondary payload, a common technique for initial access and further infection. The document body content is unreadable, but the script analysis and heuristics point to a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0116_000.js` `9c61164d481e773e9fbab4aabf99c6f1b822555bff243731cd022d0929693526`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	40352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 219 eval/decoder/string-building token(s).

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