PDF malware analysis — malicious · caffdb2afd03455b

MALICIOUS

PDF

4.0 KB

MD5: e23f344d3c466214eda3bdb32a307a2a SHA-1: 8a2f8669d584a2ab561410e4096180c7dde0b0b6 SHA-256: caffdb2afd03455badbf57272456cb7d9d3e7173f9ff7eae5a8143a6f4e856b0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript stream ('acroform_b64_00.js') likely contains code that executes arbitrary commands or downloads additional malware. The presence of 'eval()' and 'String.fromCharCode()' suggests obfuscation techniques commonly used to hide malicious JavaScript payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `ca227eee9a39c91a76d978c0a92ab6f61689b96fff28b4ef22c2e3d5f423108a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `239b6f5c2060aa9ec1a50cf90942f56cbf86adce475c2ade379a1e3832aa6d1a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3572 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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