PDF malware analysis — malicious · 4ec194409b6462c4

MALICIOUS

PDF

9.3 KB

MD5: 03606b4647e58a1492d47509486bdcc3 SHA-1: 4e8425c71150a10b6bef24bbe3b46996dcad726e SHA-256: 4ec194409b6462c4aebc5860114f99e5a135fc00e7ea19e83a9ef3b1e0fe43ef

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_XFA_SCRIPT. The ML classifier also strongly indicates maliciousness. The deobfuscated.js artifact suggests the script's purpose is to download and execute a secondary payload, which is a common attack pattern for malicious PDFs. The embedded file artifact further supports the payload delivery hypothesis.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `13808407e3eaf41a09bd69b22916f25497e71cdd67349626854ff035a399d45a`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1161 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `5ee5b3e0d7c1323a6db4d357b871972fcf0fa3a90fd871287b596c82ef872f0c`	deobfuscated-js	PDF JavaScript deobfuscation pass	1640 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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