PDF malware analysis — malicious · 1fb45fff51c6e634

MALICIOUS

PDF

2.2 KB

MD5: 12b0cd492d3a860a89e204928f2165a3 SHA-1: 0dcc8ec054d76c2a7a34338a9a93424a761caf0e SHA-256: 1fb45fff51c6e6348e51473a59c1cab6baccfc5e1f28978a3306b5c800dc160b

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by a high-confidence ML classifier and ClamAV, indicating it contains exploit code. The presence of JavaScript actions, embedded JS streams, and particularly the use of eval() and unescape() functions within decoded streams strongly suggest the execution of obfuscated JavaScript. This script is likely responsible for exploiting a PDF vulnerability to achieve arbitrary code execution, as indicated by the 'Pdf.Exploit.Agent-36082' ClamAV detection. The ML classifier's output of 0.999992 further reinforces the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7D0	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0992785d4dc3d69e2407f48b17c0934e9a004e37fcb1524e14f9e4a0696fca43`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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