PDF malware analysis — malicious · bd4ad6f86da43e66

MALICIOUS

PDF

1.9 KB

MD5: 780f39470df4286d5ebf27b6992c892d SHA-1: fda390f3e1d105a0a7e8cb3fd5c56cb2a9ae6a25 SHA-256: bd4ad6f86da43e6601e90a5d17da9f3d2393619ad6f466ac9442fa6381ba307f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` calls. The ClamAV detection name 'Pdf.Dropper.Agent-7217222-0' strongly suggests a dropper functionality. The JavaScript likely downloads and executes a second-stage payload, a common technique for malware delivery. The presence of multiple JavaScript-related heuristics and the ClamAV signature indicate a malicious intent to deliver further malware.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7217222-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7217222-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `433d6141b5fc932a52d94051061c1f7566cbde37bb51ce636d76e20ed4ab2bf6`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x671	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e673d8f7c3fd22d4f5f72c5ab54ae97975b51053fd6dd55b7da6e058e4314ba8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2828 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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