PDF malware analysis — malicious · 33a304a193e1ba66

MALICIOUS

PDF

5.5 KB

MD5: 139b13399119a6086ecb961baf4069c8 SHA-1: 9b0830cf20adbd1af5814fb816ff71a6f1be1a3c SHA-256: 33a304a193e1ba66a5268aa60c71e83ed6f7b94afd2b3dedab66b3488f619add

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF was flagged as malicious by an ML classifier and exhibits characteristics of XFA forms containing executable scripts. The embedded JavaScript, identified as 'stream_000_off0000069a.js', is likely responsible for executing the malicious payload. The presence of XFA and embedded scripts strongly suggests an attack pattern aimed at exploiting PDF vulnerabilities to download and execute further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 5

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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)
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
`stream_000_off0000069a.js` `e3097ce3c8f1277ccced6f61f80ae36e700946cd73f3611c6e403589f2c7fa6a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69A	14903 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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