PDF malware analysis — malicious · 8a69c6dbe944312d

MALICIOUS

PDF

1.8 KB

MD5: 1baf4bd39962087c731951a827865706 SHA-1: 2520dc60a16cc1f5b17312da992c2c5176ae767a SHA-256: 8a69c6dbe944312ddff265e982963d5eb8ce8f85047859d5e3b73086a8df4b79

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by the use of eval() and unescape() functions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Dropper.Agent-7280348-0' ClamAV signature. No specific family could be identified due to the generic dropper behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7280348-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7280348-0
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 0x669	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` `95b869174bc7a4825dacc1199fd3abbb496c4fcd2045c40bd42bd878c38aca6d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2816 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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