PDF malware analysis — malicious · a3c2c3724899d6f2

MALICIOUS

PDF

4.0 KB

MD5: f42dd710d9e71c5926fe5ab350197b4c SHA-1: d1960118e5b0f7dcb607dec89d46ba1d94ec9af2 SHA-256: a3c2c3724899d6f29c5d4b3dda30728e8b2d67193cd88baa1c796e0fb8a61918

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7685810-0. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscation. The ML classifier assigned a high probability of maliciousness. The primary function appears to be downloading and executing a second-stage payload, as suggested by the dropper classification and the use of obfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685810-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685810-0
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` `7d7b354bb861b17bd01cfce14dfdff1171781f2435d56d5d3e513ab19bb49c97`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6325 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` `740772a084785779808cc68691f948678fde23dda7cda79ff32fbcfb8e53fe2a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3589 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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