PDF malware analysis — malicious · c099253fdd562789

MALICIOUS

PDF

7.1 KB Created: 2009-09-07 19:43:09 Authoring application: Eblasha 8.5.9.4 (via PDF Library 4.10.4.2)

MD5: 54aef92cdabb2b0a71eccb83437bc187 SHA-1: f61436465e11e038a225e9bb823fa8ea33f367c7 SHA-256: c099253fdd5627898a25f4f56e6f91f4ce6f4066f4f4502452b19d1092bca88f

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple JavaScript streams, with one stream exhibiting eval() calls and String.fromCharCode usage, indicating obfuscation. This obfuscated JavaScript is likely intended to download and execute a second-stage payload. The presence of PDF-specific heuristics like PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE further supports this conclusion. The file's metadata indicates it was authored using Eblasha, a tool sometimes associated with malicious PDF creation.

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` `dea6f59296d735e7a84a0623ec757b850515da255a58f8ce49bd9c7052511e66`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21393 bytes
`javascript_obj0015_001.js` `08dba5b00635bad947faad6ac16a162be56ea77f493cb5d1399c4ecfee350ecf`	pdf-javascript-stream	PDF /JS object 15 at offset 0x181A	187 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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