PDF malware analysis — malicious · dfcdfe7db58bda38

MALICIOUS

PDF

2.7 KB

MD5: 306ab60a00564d99b2df9357e1ad5186 SHA-1: b8c6ae1126025194fe67136609eb1c57aad1f896 SHA-256: dfcdfe7db58bda388f61569b67d43d983bb6bbd9d44b78a7a05627905891fab7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript, specifically javascript_obj111712_001.js, is likely responsible for executing further malicious actions, such as downloading and executing a second-stage payload. The presence of eval() and String.fromCharCode suggests obfuscation techniques are being used to hide the script's true intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `853496940c9d6a8f0f5f613e92e12ccac786fc72822a4927bf0774eb07b94ce0`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2507 bytes
`javascript_obj111712_001.js` `b6ac4c57fe584323741d0f7ad1c70f3925a32289e05490f9a0f7054c0a966337`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x89E	647 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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