PDF malware analysis — malicious · 776353192e3c947d

MALICIOUS

PDF

4.6 KB

MD5: 3e721b42351d248dd6181d016495a8cc SHA-1: a7c89c9baa2839fafba4755a6707969a8482dae9 SHA-256: 776353192e3c947da876c0d88677c63e229ef9a81487239404f656286846109e

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_OBFUSCATED_NAME_OBJECT'. The ML classifier and ClamAV also flagged it as malicious. The embedded JavaScript, when deobfuscated, likely downloads and executes a second-stage payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Hex-obfuscated structural name object high PDF_OBFUSCATED_NAME_OBJECT

A structurally-dangerous PDF name (e.g. /OpenAction, /Launch, /AA, /EmbeddedFile, /SubmitForm) is written with #XX hex escapes to evade string-based scanners. Legitimate producers write these names literally; hex-encoding them is a deliberate obfuscation technique.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `4f8af61b25db8ca91f8b64728e181b957a023eb2ffa02f4d908e32a1a81b3bf4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x318	33115 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).

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