PDF malware analysis — malicious · 71d34754ed84225b

MALICIOUS

PDF

5.7 KB

MD5: 1ab5a7409ad5f7e4e146a9ee75c6f569 SHA-1: e5ff94dbadd1fa87b403f65cc2e7ad9a5abc434e SHA-256: 71d34754ed84225bdac4960158c7fccd95492b376326264bb8ee413ccbc67e8f

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, flagged by multiple heuristics and ClamAV as malicious. The JavaScript stream, named 'javascript_obj0013_000.js', is likely responsible for downloading and executing a secondary payload. The presence of obfuscated names and ML classification strongly indicates malicious intent.

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` `1f6e4a87a48ddf73075dba27f8ab087b19dec43b7b7ffb109e00f5f4111ea678`	pdf-javascript-stream	PDF /JS object 13 at offset 0x318	36158 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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