PDF malware analysis — malicious · e06f0efc1aebfd87

MALICIOUS

PDF

6.9 KB Created: 2009-09-15 19:46:89 Authoring application: Eblasha 6.8.3.7 (via PDF Library 8.3.7.4)

MD5: bbd53dbef1f5decf3fc20406a35aa0da SHA-1: b0d64b411c9bf7ba90104958472c242f38f0652b SHA-256: e06f0efc1aebfd87c6b2060f53ae69924acf13a4f638badc6dc06a360b0e0aa4

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 strongly flags this PDF as malicious. The embedded JavaScript, specifically the file javascript_obj0015_001.js, is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `a18671f51319698b1113751ff07963ddaf2af93791fd30bf8bba76db99f079bc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21312 bytes
`javascript_obj0015_001.js` `a574e8e95adb9352807042e96ac7ddb4e5b23a0f6efac5abf118f02532fce8a9`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1768	184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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