PDF malware analysis — malicious · f5d8ddb7e6d15a32

MALICIOUS

PDF

8.0 KB Created: 2009-09-11 19:41:49 Authoring application: Eblasha 2.6.5.3 (via PDF Library 10.9.10.5)

MD5: 5bbd44c648db2da96ba58eb3e673bb58 SHA-1: 7519e18db26b49d950495fc53bd5f2a5d66ee583 SHA-256: f5d8ddb7e6d15a3248acb972cd2834dbcdf595564ee975b6a510b6dbf299d195

74 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 eval() call and String.fromCharCode usage suggest obfuscated code execution. The embedded JavaScript streams, javascript_obj0013_000.js and javascript_obj0015_001.js, are the primary indicators of malicious activity, likely downloading and executing a second-stage payload.

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` `f0577e54c89a9cbe63c6508fe1f440c3337e55dd9d0c9d92021aaaafba3e82e8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21241 bytes
`javascript_obj0015_001.js` `2feb5dc43ace98b9cdabba77ef41be8450b96ef914c9d9b93bbf0e2e52f5f97d`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1BAD	205 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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