PDF malware analysis — malicious · a490b9a93e1fa262

MALICIOUS

PDF

17.2 KB Created: 2009-05-13 00:58:36 Authoring application: HNpjXo (via fODRx8F3ftr)

MD5: 617afd6f7faf0dbfb319c2348fdd637e SHA-1: 98199cfad0ef24021d6df78bf44d52bddb587b14 SHA-256: a490b9a93e1fa2629827a120c9bf98c902a5522dbf2dd236a1efe6df06861040

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated and uses `eval()` and `String.fromCharCode`, typical of malware attempting to hide its payload. ClamAV detected this as Js.Trojan.Obfus-48, confirming its malicious nature. The script's obfuscation and the use of `eval()` suggest it downloads and executes a second-stage payload.

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1f4f0798c431abde08f11db9ce09a1fe35632e9cef5edb0eecae32ef17c5292d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	16250 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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