PDF malware analysis — malicious · ffc3f5c63becb500

MALICIOUS

PDF

7.0 KB Created: 2009-09-15 19:47:58 Authoring application: Eblasha 1.3.4.8 (via PDF Library 3.6.3.10)

MD5: cf6abd036486c30dd8c5727b5af1460a SHA-1: 7de674989eafc02c5a9d2b7f89f867ba0965161e SHA-256: ffc3f5c63becb50059ce4279548dfd0207d80defbc09fc5230aae3c489c96bcd

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE indicates obfuscated JavaScript code that likely attempts to download and execute a secondary payload. The ML classifier strongly supports the malicious nature of this PDF.

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` `7879ebae74f9e46d4a7a7d91469388a2c27b579f039178d65d62878a3e70fa4d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21294 bytes
`javascript_obj0015_001.js` `f7591ee1813a83515dc4e93150a4c342f2b67405ea0bff4a474505b3e58af4e8`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1803	199 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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