PDF malware analysis — malicious · bda981d0911d37b4

MALICIOUS

PDF

13.6 KB Created: 2009-05-02 17:50:23 Authoring application: QMisFrvPbZHh (via DPpgikzXzZPsXnVl)

MD5: 28e7add21d110ed1cdbb4c14a388838e SHA-1: e56f078b8aa6a9de12cfd134fbfccb8e2a92b110 SHA-256: bda981d0911d37b4c41444484c0e25d2eb3e03a9c4aae281bdf0812e7b03abf4

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-35572. Static analysis detected embedded JavaScript, including the use of String.fromCharCode, and an ML classifier assigned a high probability of maliciousness. The embedded JavaScript stream, javascript_obj0009_000.js, is likely responsible for exploiting a PDF vulnerability 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_obj0009_000.js` `4de77baa470232e3021a8b04fe4535b2624b90bca070095d0d4a6d72b0ba799c`	pdf-javascript-stream	PDF /JS object 9 at offset 0x7D5	11144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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