PDF malware analysis — malicious · d9740f3c25afef6e

MALICIOUS

PDF

4.0 KB

MD5: c86e38ed9995d847185d1f527c1c5e2b SHA-1: ee31402806b948b464a97bf1d9918a0cc696a53d SHA-256: d9740f3c25afef6e2132a14685cc7eb0ded3cb590ac10e978315950261c0750c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream, 'acroform_b64_00.js', suggests the execution of obfuscated code. This pattern is commonly used to download and execute further malicious content. The presence of 'eval()' and 'String.fromCharCode' within the decoded stream points to dynamic code execution, a hallmark of droppers and downloaders.

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` `31a5df3b1e942fdd44fecf0abd301be19cac06efa1c22b62eff77812a9e30ba8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6349 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` `1423b49062583b7ef1e5475a93db43ee8aca21110faeffc2bedd6bc20b793c7e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3608 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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