PDF malware analysis — malicious · 8c1a89a960d0784f

MALICIOUS

PDF

4.0 KB

MD5: b38e58926e0248f2de1b5debcb1c928d SHA-1: 4f7bdf35a86e6e5cc9f64e1202867c56555856b6 SHA-256: 8c1a89a960d0784fb1cf74fc3cd5804c6b2299ca48d5283346b8c1c807f57389

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is further obfuscated and uses eval() and String.fromCharCode(), suggesting it's designed to hide malicious code. The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' flags 'Suspicious extracted artifact' with 'Script obfuscation indicators' and names the deobfuscated JavaScript file 'acroform_b64_00.js'. This strongly suggests the script's purpose is to download and execute a secondary payload, a common technique for malware delivery.

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` `2ef03e59fc02af7539e11ea25f6278cb5f76e9f2b1a42832e5909d80748bcd51`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 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` `80fe709837c0562e92e6633d6240d80ed11d24f57c63bb226bdc50dca87e88a9`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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