PDF malware analysis — malicious · cf8bdbc9b9a790f4

MALICIOUS

PDF

4.1 KB

MD5: 9bb115928db76dd6ca194d232d6b692b SHA-1: bacfa75f1929c9662be33f9779d513e210050393 SHA-256: cf8bdbc9b9a790f4215d5e2310c10596d1665fd44849c834f9dd7a3b66e7a662

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 `eval()` call and `String.fromCharCode` usage within the JavaScript streams suggest code obfuscation and dynamic execution. The presence of deobfuscated JavaScript files (`acroform_b64_00.js` and `javascript_obj0013_001.js`) further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, although the specific URL or execution method is not directly extractable from the provided evidence.

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` `1e94130d5e1abca75716d819eba44fb11d3fdd028de5a5eadf3d91151e910eb0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `093e8c08dddae20438337b6408431a9e9c10945b999bf52b2a8666bd11ec32ab`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3604 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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