PDF malware analysis — malicious · 38c2508deacc6159

MALICIOUS

PDF

5.5 KB

MD5: b6d0fd3af65228de837347d94abc3435 SHA-1: ca4956895da769469cec8ee1d9c1182189007ede SHA-256: 38c2508deacc6159027b8129d4c2dd803df556016ed31d68f44a0a2bceeda176

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an XFA form with embedded JavaScript, flagged by multiple high-severity heuristics. The ML classifier strongly indicates maliciousness. The embedded JavaScript, identified as stream_000_off0000069a.js, is likely responsible for executing the malicious payload. While the exact script functionality is not fully detailed, its presence within an XFA form and the associated heuristics point towards an exploit designed to download and execute further malicious content.

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` `94afdee31a9728190ff0eb4d4ecbe710ef787ee33a3da49945150f6e5812b3d3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69A	14704 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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