PDF malware analysis — malicious · fe866ac29961a073

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 1d4a5284573ddc951eee469a8d5403e1 SHA-1: c0d1ae401758a966549a3f3b15917b6161567030 SHA-256: fe866ac29961a073209b9ef20bdc64e6c97c414cdc8108bbcdb268694422cc0d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests the JavaScript is being used to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The extracted artifact 'javascript_obj0001_000.js' is likely the malicious script. The script's intent is to download and execute a second-stage payload, as suggested by the combination of eval() and embedded JavaScript.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `f4eda075a12e9b356a08722cb10fb63a5298f1ca6e50bc6cb74a53dd1f209d89`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	930 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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