PDF malware analysis — malicious · 87cca1ffd7ecfcbb

MALICIOUS

PDF

1.6 KB

MD5: e6de9bcb599dd2761f33ecce52fb50ab SHA-1: 6e465673602ce8a34610290e77113c208d8c46bb SHA-256: 87cca1ffd7ecfcbbad90181f22de31d7fdc70445380fd47602540c1cc80035ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Heuristics.PDF.ObfuscatedNameObject. Static analysis revealed embedded JavaScript with eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The presence of an extracted JavaScript file (javascript_obj0009_000.js) further supports this. The script likely downloads and executes a second-stage payload, though the exact URL or payload is not directly discernible from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9962

Heuristics 6

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 (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0009_000.js` `5b8d3b98050cefa0d78729929e69bea1439ab548062345ca91053a1cdef02bac`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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