PDF malware analysis — malicious · c7956be3c29e89b9

MALICIOUS

PDF

20.0 KB Authoring application: null

MD5: eb9f9b7e1b14110c587dd70e80ef3227 SHA-1: 5239397781d159b5086ed00ab67ee34adbd4ea55 SHA-256: c7956be3c29e89b9ef094fbcd6c0992f658b017fc4a4cc9a080e914309896da6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF document 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 uses functions like unescape() and String.fromCharCode() for obfuscation, suggesting it's designed to download and execute a second-stage payload. The document body mimics a PGP software order confirmation, with a suspicious URL pointing to 'customers.p' likely serving as the lure for the malicious download.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://customers.p
- https://support.pgp.com

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `adee1edd95e603a67a0d48751a547214523fada1fbecd7694de15e3eb8d1938c`	pdf-javascript-stream	PDF /JS object 4 at offset 0x3E0F	4225 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 12 long base64-like blob(s).

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