PDF malware analysis — malicious · c077718392c93d59

MALICIOUS

PDF

11.0 KB Authoring application: Criminal acts rolled under the dice table.

MD5: afa7c76aa2a6008f20ca060dfe653a21 SHA-1: 5782a11e6a375c09c49f1dcbfea4b4decd044096 SHA-256: c077718392c93d5902ad4c2aa7abd92516c1534b14721187363feef8eb2e0095

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream was further processed, revealing obfuscation techniques like unescape() and String.fromCharCode(), suggesting it's designed to download and execute a second-stage payload. The document body text, though partially garbled, contains phrases like 'Criminal acts rolled under the dice table', hinting at a deceptive purpose.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `7fc39a009ee45e56e340e2e77177e576072e44f2f4f8a09daa73af198b664c52`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162884 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.