PDF malware analysis — malicious · 7a18aeef49e98d4b

MALICIOUS

PDF

9.5 KB

MD5: e450f37c96107e4036ca672770b6baf7 SHA-1: d7f8243f40aa01960dcfbeabb161bc8f711ac382 SHA-256: 7a18aeef49e98d4b902c9da64419ae6fcd032b64c29c0a732f681c536934a90e

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and likely intended to download and execute a secondary payload. High-confidence heuristics for embedded scripts and ML classification strongly indicate malicious intent. The presence of a deobfuscated JavaScript file and an embedded binary artifact further supports this assessment.

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` `4caca1001ff69a05b0c80fb1e1927eba6ef6a1cd1b990c2b9df73ca126475f8c`	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` `069be217eebf50fad2c23da87e9764654dde04f2c82fb60f024c8dc635f1c1b4`	deobfuscated-js	PDF JavaScript deobfuscation pass	1355 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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