PDF malware analysis — malicious · 4ab30b06517f44ad

MALICIOUS

PDF

5.5 KB

MD5: eff07567e0d8c48b0aa5fa3b53220ab1 SHA-1: 4373504cb38d903336d76315ca9dbe7ab49b9b72 SHA-256: 4ab30b06517f44ad12948eb54974ace40f5fe7ee498357f0c2943a0ddf22332d

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript, identified as 'stream_000_off0000069a.js', is likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. The XFA form structure further suggests a deliberate attempt to leverage PDF features for malicious execution.

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` `d10a83ec4007d3d6356b55e5b67d02850c7bb144e05271c42246a781a68d9d10`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69A	14728 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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