PDF malware analysis — malicious · 3831335baf53d528

MALICIOUS

PDF

7.0 KB Created: 2009-09-23 19:43:52 Authoring application: Eblasha 4.3.6.10 (via PDF Library 2.4.4.9)

MD5: 5c751755821e7f58009db57ea0f52065 SHA-1: c7028a47c5c93f15d711aaee3e1b7db49d033fd9 SHA-256: 3831335baf53d528eb5a8daf83d7fdb4dc0c21cf7abdaea55132b151c851f6a0

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a call to eval() and String.fromCharCode, indicating obfuscated code execution. The heuristic firings suggest the JavaScript is designed to exploit PDF vulnerabilities. The extracted artifact 'javascript_obj0015_001.js' is likely part of this exploit chain, aiming to download and execute 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` `0019d954a227793917c20cffaf306aa34cdf3cab1c79221a53602569a0f098bb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21095 bytes
`javascript_obj0015_001.js` `026d2e4a93cdfc88bd06f94df1041d5a67b7e227e54329ccb7f0069102ec5e0c`	pdf-javascript-stream	PDF /JS object 15 at offset 0x17E2	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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