PDF malware analysis — malicious · d3e4dc3a57670647

MALICIOUS

PDF

4.0 KB

MD5: 6d6d1c55724c41d6bbe3cda5a246d236 SHA-1: 58cc5a1ea9f402e0bdf9b6b0af53872d20628d0e SHA-256: d3e4dc3a576706479725d322268bf1f31b7290e88aae0b3266209bfd255185ff

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical ClamAV detection as 'Pdf.Dropper.Agent-1828995' strongly suggests a dropper functionality. The presence of 'eval()' and 'String.fromCharCode' in the JavaScript streams points towards obfuscation techniques commonly used to hide malicious code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload, which is a typical dropper behavior.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828995 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828995
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` `4f763d1d2122722363f6e62459bbb17990a2e09902d848b53205be681882a1f9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 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` `f772e24ec89444681200a6fa77545b67885fa32d24c8af97ae82a4c35ed63039`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3619 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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