PDF malware analysis — malicious · d1a1921373db687e

MALICIOUS

PDF

7.4 KB

MD5: 15bfe6b4df3683b4a799d497be8e1648 SHA-1: 6d1bc5922370a392b8c03fc5b9f7a1365935232e SHA-256: d1a1921373db687efb52e56e29445fff9078c9795dd4185630a75767bdb719f7

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF utilizes XFA forms and embedded JavaScript, indicated by PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, stream_000_off00000e27.js, is likely responsible for executing the malicious payload, though its exact function is not detailed here.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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_off00000e27.js` `ddcf0ea241eb456eb5ece31a375363d96f9427f99fea74b591a1471b84665b8a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE27	14700 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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