PDF malware analysis — malicious · bd9355978a4fb634

MALICIOUS

PDF

9.2 KB Created: 2009-06-11 01:34:07 Authoring application: mCQEZlJMXeVwHZKehkjAe (via GocyQDaiIknVZjOHFJjD)

MD5: b46dff13091c2a52c47f1a96c6ca1c64 SHA-1: ae4ed81c6cf5fefd4f84b6de54f2b35a72d7fcd9 SHA-256: bd9355978a4fb63480a8753ec4eaa33a40839704ca0a68c58b9f91272ba48d37

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious (Pdf.Exploit.Agent-35572). Heuristics indicate the presence of embedded JavaScript, which is further supported by the extraction of a JavaScript file. This script is likely responsible for exploiting a vulnerability within the PDF viewer to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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` `8d84ea71b0296faa70aa9fba9dcfa2d6ebea6627238c187693c087ab3f391230`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4AB	7488 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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