PDF malware analysis — malicious · 41fbe2cfa31540fb

MALICIOUS

PDF

9.3 KB

MD5: a4f810f29d00b15fef84eec18415dd6e SHA-1: bbc2948a661e8627946ee30179c0c93af95b32ee SHA-256: 41fbe2cfa31540fbfdc0156d749a201aedc67e7f40b361f96ff6c8d88ebd3748

156 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_XFA_SCRIPT. The embedded JavaScript, named 'deobfuscated.js', is likely responsible for executing malicious code. The ML classifier strongly indicates maliciousness. The exact payload and execution chain are not fully discernible from the provided evidence, leading to a slightly reduced confidence.

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` `00c53870c3cd2b295ac367cf732cf1a1ab1c615b5eace2022846ad5cf7fe9f7e`	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` `6ce30c323646bdd1027bf1cd1f70b6210dcdddaf09589e137ba490afde450964`	deobfuscated-js	PDF JavaScript deobfuscation pass	2232 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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