PDF malware analysis — malicious · 49319b27d610420c

MALICIOUS

PDF

394.9 KB

MD5: eb9228f17568704676385428d3bbefff SHA-1: 74543610d9908698cb0b4bfcc73fc007bfeb6d84 SHA-256: 49319b27d610420c82dd41dde6fed24ebec09f858859b7815211ccdbfce1c3b7

230 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF contains XFA form elements with embedded JavaScript, flagged as a heap spray exploit. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript, stream_000_off00000049.js, is highly suspicious and likely responsible for executing the exploit and downloading a secondary payload. The document body appears to be corrupted or heavily obfuscated, providing no clear user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
ClamAV: Pdf.Dropper.Agent-1556153 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1556153
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_off00000049.js` `0bbde1701f01134db79d73b438a8bfe2779f544dbf8ae4e25033584013d43a41`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x49	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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