PDF malware analysis — malicious · d8cb86d7bbb32dab

MALICIOUS

PDF

4.1 KB

MD5: 0c56fc0efbed6c6a5d737cc22a0e2778 SHA-1: 34b18d338367388c91825560131dc3920b7b06db SHA-256: d8cb86d7bbb32dabaeb95c4da27ef1753cfdb07ad0b1cd4656f4eba93d05634c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings suggests that the JavaScript is obfuscated and likely uses eval() to execute arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious due to their size and obfuscation. The primary intent appears to be the execution of malicious JavaScript, which is commonly used to download and execute further stages of malware.

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` `6a9e0c849803493873f801d483644cc83bfcddbf37f6828e09467d4d8c091ffe`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `8d7ad239b6e006ec8c63fc687498467c096b2d53ca542c4362cc95d7a54cd530`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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