PDF malware analysis — malicious · f362d8259e8bb82b

MALICIOUS

PDF

4.0 KB

MD5: f177929606e0cd7a067e21f550dd6923 SHA-1: da8e88a82c28cc3fb092cf99e572cb7ebe86b276 SHA-256: f362d8259e8bb82b0af9ad1e1281a4b934dc950469871e45994c2e4785a08828

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript code is likely obfuscated and uses eval() to execute arbitrary code. The ML classifier also strongly flags this PDF as malicious. The deobfuscated JavaScript stream, acroform_b64_00.js, is the primary artifact for analysis. While the exact execution flow is obscured, the presence of eval() and fromCharCode suggests the script is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
`javascript_obj0013_001.js` `965edd5a6bcc820f6cdcd51c326876e4ea81affb999b1aa3e4bda0821a6cb45a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `2b482d5fe1f226e4eed25e74dca3a99ea6a0eff2367ec6389e229efd14d23a74`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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