PDF malware analysis — malicious · f7b8f65e0f233d92

MALICIOUS

PDF

4.0 KB

MD5: f89ac01ddb6df088eceb457b6a505257 SHA-1: 7554b6a10a52ee4650db796c6f5c5a15f36fc708 SHA-256: f7b8f65e0f233d92c0229fde0789a3d7fa53190623a3bbfc383aaac98d3e83fb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

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 presence of `eval()` and `String.fromCharCode` within the decoded JavaScript stream suggests obfuscated code execution. The deobfuscated JavaScript file `acroform_b64_00.js` and the embedded JavaScript stream `javascript_obj0013_001.js` are the primary artifacts. The script's likely intent is to download and execute a second-stage payload, which is a common technique for malware delivery.

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` `6fd7ee836d634a43960af838ae34d489b32d7ebc29cd1a03a752068ba6771fd6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6397 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` `505211e50e1c26581e1020657932708d59d5b68201145ea44ccaeadc57be09ea`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3643 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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