PDF malware analysis — malicious · beaf5dfb4d95e070

MALICIOUS

PDF

7.8 KB Created: 2009-09-26 19:41:95 Authoring application: Eblasha 8.7.3.9 (via PDF Library 5.6.10.9)

MD5: b97736985b28e6366b38e91fe1ebe500 SHA-1: 1be6ec3ea85afae29d23a902fd4a920f45e96482 SHA-256: beaf5dfb4d95e0701a868056c899cb672e4bd60deef9a4a2d0a744976a8d6a54

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, specifically javascript_obj0015_001.js, is likely responsible for downloading and executing a second-stage payload, as suggested by the eval() call and String.fromCharCode usage within the decoded stream. The document body is obfuscated and does not provide clear user-facing content, reinforcing the malicious intent derived from the script execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_000.js` `fe49f65dcfcef80314c40d29d5baf9c0fa21a533abe1a8cc21cd25ce1e0cd125`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21220 bytes
`javascript_obj0015_001.js` `e4300d83e052b11369829682df983323aaab4bfc9f6d2f892f07ce6d1779ac12`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B00	184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.