PDF malware analysis — malicious · fc94e8a2680bfcc0

MALICIOUS

PDF

4.0 KB

MD5: 8da2e1ff58d8ade15775d452ad454be3 SHA-1: aa2b708f65363704e60eefe473de82582699af3d SHA-256: fc94e8a2680bfcc021d00f9a80f1ede942860ddff2468e029a0afc062b61acc9

66 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', 'PDF_JS', and 'PDF_EVAL'. The 'acroform_b64_00.js' and 'javascript_obj0013_001.js' artifacts suggest the presence of obfuscated JavaScript. The 'eval()' call and 'String.fromCharCode' usage within the decoded stream are common techniques for executing arbitrary code. The primary intent appears to be downloading and executing a second-stage payload, though the exact mechanism is obscured.

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` `0adcc85f4e0845cf54a9d7c4f64bd74d4e4a4128fece9211e13b5fddf0245350`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `c8faf3b89b7ca1ec62e9d549e244cd0f265678d88f145951ee412e28ac6757cc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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