PDF malware analysis — malicious · f804053283d79163

MALICIOUS

PDF

17.5 KB Created: 2009-06-30 22:18:27 Authoring application: NdKLAE6 (via BJVhGCo)

MD5: 72646e2e2f931eaaad2eb212b019bcd0 SHA-1: fc7b1342ee82d1ce98ffb389af8ee4faa2b71f77 SHA-256: f804053283d79163c85918f1aaca3f031e2d91525da192afee3d24be07946407

126 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 ClamAV detection 'Js.Trojan.Obfus-48' strongly suggests a malicious JavaScript payload. The JavaScript stream is obfuscated, and the eval() call is a common technique for executing such obfuscated code. The primary intent appears to be the execution of a malicious script, likely for downloading and running 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` `6c59b2c44fa3b2ce96795b00eba8f4a5c091c9cf082fd2b525d5bb80de1884d6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	16582 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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