PDF malware analysis — malicious · 1ade61fbe98d9531

MALICIOUS

PDF

2.3 KB

MD5: 62fef3eb20ee4dc22188d6b17910f3a0 SHA-1: bdd4ecb09c4c72d591a382a364c1d71f9a2787d7 SHA-256: 1ade61fbe98d9531f005fe4c5013c458884f6c5a434070eb9ffaff06ade65c04

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This script is designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Dropper.Agent-7235281-0' further confirms its malicious nature as a dropper. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js', are indicative of the malicious script's presence and obfuscation techniques.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7235281-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7235281-0
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` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x807	478 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` `a2f421634588d60190adf3197d8025a97b981e2aa1401b1f843a20f78b648098`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2876 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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