PDF malware analysis — malicious · 516f228326962b81

MALICIOUS

PDF

7.4 KB

MD5: d239b5063a5b18406a5d40bbc4321f29 SHA-1: 0b543107e3c168aaa46b1603f08fa321f9738179 SHA-256: 516f228326962b81944b8add4b66a4e0e8314df8c2393e4d255d77d14ea9e2d3

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged as malicious by an ML classifier and exhibits high-severity heuristics for embedded script payloads within XFA forms. The decompressed JavaScript artifact, stream_000_off00000e27.js, likely contains the malicious code responsible for further execution or payload delivery, although its specific actions are 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` `095b521b31702dc8907cae404b46be8cac0da31c37ccb134cc3c85692e8f130e`	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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