PDF malware analysis — malicious · 587069a4b8878a34

MALICIOUS

PDF

4.0 KB

MD5: fb4d93586235fdb82322587f88d9ac55 SHA-1: 26bcb032f68d2a200ae7e3691fa512019a1a4b7f SHA-256: 587069a4b8878a341eaaecc1219f03174ea6b22cce7cd8dc5c38cee195fa032d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 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 with high confidence. The JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'eval()' and 'String.fromCharCode' calls within the decoded streams. The presence of obfuscated JavaScript files further supports this malicious 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_obj0013_001.js` `2403acf8eb3aab525a588b25ea31d746c5fe783710c4c3d09c75d11fd0389bb4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6289 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).
`acroform_b64_00.js` `2d1b2e513ec606fa688c4ebf1a96f2fccc7c088769cc3dd75caa61288a1e60f0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3562 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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