PDF malware analysis — malicious · c7116cd99aeab858

MALICIOUS

PDF

4.1 KB

MD5: 3d7b06831a06ba8ad967ee3d7c3afff6 SHA-1: 9afbf0ba4cfa338097ed742f6eab925691ecdd6c SHA-256: c7116cd99aeab858acbbb93b467d5a47dba8d9368e1d8a051f29ebac6c4aa1f1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical PDF_EVAL heuristic firing suggests the JavaScript is likely obfuscated and uses eval() to execute code. The ClamAV detection 'Pdf.Dropper.Agent-7685833-0' strongly suggests this is a dropper. The extracted JavaScript files, particularly 'acroform_b64_00.js', likely contain code to download and execute a secondary payload, which is a common dropper behavior.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685833-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685833-0
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` `2b9605302234c58acf8ef558b59e622c3169608f7b1654301902244f30885134`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6393 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` `88719f699aa859d1ef61bd4ec559e8a8827a5af96c77c1f0a1f620745fb59897`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3641 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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