PDF malware analysis — malicious · 2a16f605e59b8da6

MALICIOUS

PDF

7.8 KB Created: 2009-09-24 19:43:41 Authoring application: Eblasha 3.1.6.2 (via PDF Library 10.6.9.7)

MD5: ce78aea4ff407aa03ec8cab6c0ebf771 SHA-1: ca0f75c7f75b8812934956e5b4b62a3ad958cfa9 SHA-256: 2a16f605e59b8da6a8edde493fe4f2867565ff02fefc0c1b8e88704f80110a0d

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code designed to execute arbitrary commands, likely to download and run a second-stage payload. The extracted artifact 'javascript_obj0015_001.js' is suspicious.

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` `79c374687022ea2cf79a76a4ee39303cc17fc54ca095dccada94a8b4d33c87ac`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21200 bytes
`javascript_obj0015_001.js` `6c665ea22521f949760a264d9a1f779da830ccc04a5d7fd435a892cf2198c168`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B0F	208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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