PDF malware analysis — malicious · d103c7e42e7b269c

MALICIOUS

PDF

9.2 KB

MD5: 0e8a2ee2fe7e4f7ba8daa259a5fc6fe0 SHA-1: 51d562f6708788361c1cf19817b18d0711b65f17 SHA-256: d103c7e42e7b269c7d4db34bc39b15d0048b63809c1fef2adb5b8ed8eee82f69

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits characteristics of malicious intent, including the use of XFA forms and embedded JavaScript payloads. The ML classifier strongly indicates maliciousness. The embedded JavaScript, specifically 'acroform_b64_00.js', is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The presence of multiple extracted JavaScript files further supports this. The exact nature of the payload cannot be determined without further dynamic analysis.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 3

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
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off000000f1.bin` `2dcd66bc877eb5497a432be31aace25bd425a31bfd9f5a56daf2efb6b510fb46`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF1	11216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`stream_002_off00001c29.js` `802d438667647c22effba3673c8068f34e58b653ada783afc1e0d65d256071f9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C29	5533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`acroform_b64_00.js` `febd711333bcc33a4ae9965f269645aaaca7963235541481f66c9e765240b72f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0xF1	8412 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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