PDF malware analysis — malicious · 41dae2072760ce05

MALICIOUS

PDF

4.0 KB

MD5: 505e9bd9b6e490ea7f392d24a8225b75 SHA-1: b5d4085ecd7532843a4a4bcbf43c42d1279772e5 SHA-256: 41dae2072760ce050023bb535da67d387901454d6f769552d3f92718c1460691

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a secondary payload. The presence of deobfuscated JavaScript files further supports this. The ClamAV detection as 'Pdf.Dropper.Agent-7685781-0' confirms its malicious nature as a dropper.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685781-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685781-0
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` `a12bc83abce7f4755aa9448e304b68a73e41b508523e52f6108001d921c0235f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6293 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` `385cdfd82aa5b43e52c27ba94c16601b62d8e9d7c1ed50e9213835f1e449dfc3`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3567 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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