PDF malware analysis — malicious · 40e2b7cc312a1f65

MALICIOUS

PDF

4.0 KB

MD5: 715fee53309b9a6029f6a0993d16ce2d SHA-1: 7265eb2465e9d83a4b46394f65a9c0211be82c12 SHA-256: 40e2b7cc312a1f653b01e648e413c3a27a25c218605fcfdfa18424487e38e03e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution within the JavaScript streams. One of the extracted JavaScript files, 'acroform_b64_00.js', was identified as deobfuscated JS. The ClamAV detection 'Pdf.Dropper.Agent-7253984-0' strongly suggests this PDF acts as a dropper for further malicious activity, likely downloading and executing a second-stage payload.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7253984-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7253984-0
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` `216c5c8c838999005d9153f09cecd82d3d01521cee9efa8feec68ef805cfad7c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6289 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` `f79469f3718c34a587960648cbb14347dc9644fd0f472b677414c6669f5f3eb2`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3562 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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