PDF malware analysis — malicious · 43c7bbb37a5886ea

MALICIOUS

PDF

4.1 KB

MD5: 09b3498902cbf8b3518f6fb17e0cfe05 SHA-1: 561a5a01759757613282d5758e23011199ba72cc SHA-256: 43c7bbb37a5886ea2259d8ce6aba1c7226a3063e838d9447a62593eff7ead106

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 presence of `eval()` and `String.fromCharCode` suggests obfuscated JavaScript code designed to execute arbitrary commands. The extracted artifacts `acroform_b64_00.js` and `javascript_obj0013_001.js` are likely components of this malicious script, which probably downloads and executes a second-stage payload. The lack of specific IOCs like URLs or hashes prevents a higher confidence score or more specific family attribution.

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` `adfaf6eeb8841349cd1936d9ddabba9861cd0579000c8709eb9d7eda627f5a14`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 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` `c5ccfd4245dae99471f655bc2b09aecd9fdd177c30fda738b0f6266ec526b575`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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