PDF malware analysis — malicious · 9809f793093e76e9

MALICIOUS

PDF

7.9 KB Created: 2009-09-11 19:44:70 Authoring application: Eblasha 2.3.1.10 (via PDF Library 1.1.1.2)

MD5: 6636e52efe71bd4e33ec8c08ea2711bb SHA-1: b9c1fda38a728f2c627a7ccd55def9d48665e5b1 SHA-256: 9809f793093e76e902ad73b214f0967e7abd9f316b2d23506f5d897846155ba2

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated and utilizes String.fromCharCode, suggesting an attempt to hide its malicious functionality. The primary intent appears to be the execution of arbitrary code, likely to download and run a second-stage payload. The presence of obfuscation and eval() calls points towards a downloader or dropper mechanism.

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` `9586d20d3be83c9128ae1510ee9b12daa793ea1e8562a97e213a488af7fa01be`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21151 bytes
`javascript_obj0015_001.js` `7b5ca84760ec23f960fde88bc65e7a4a86d042343a0554903ec44fe6369f89fd`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B6E	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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