PDF malware analysis — malicious · cc7b1dc33cc146c1

MALICIOUS

PDF

10.9 KB Authoring application: .a

MD5: e777282968f89250483a7587e0207117 SHA-1: 2c5601d7381c297104bf7e573ee4ea3b28dda639 SHA-256: cc7b1dc33cc146c114e888ab1621df9282193ca25adb405a91a425c7b252edd7

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, named 'javascript_obj0018_000.js', is likely responsible for exploiting PDF vulnerabilities to execute malicious code. The presence of unescape() and String.fromCharCode calls suggests obfuscation within the script.

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` `e87fa370abd9e9331dba6679b9b46e0605dff5fdf210a003126ae5785ae3b881`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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