PDF malware analysis — malicious · 61bc172103c8a415

MALICIOUS

PDF

8.5 KB Created: ç[ö/ óà²î/dº Authoring application: ðG¯}G°à«í4f (via ðG¯}G°Á:ç^Õâ9¼Ö.-\Yåþ¦)

MD5: 1a7551dbbff9d5f1dfa48c2764d17b14 SHA-1: 2fb01b3be19779fdf8bddcb82f9701aad9da3560 SHA-256: 61bc172103c8a41553e02cd0e0a1536ca846c35bb522a415429f4db2e123a797

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is flagged as malicious and heavily obfuscated. The ML classifier also strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'PDF_ENCRYPTED_WITH_JS' heuristic which points to an 'OpenAction' hiding the payload. The presence of JavaScript and the obfuscation techniques suggest a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_001.js` `1bb5fe1ceb548f5a79cf0f675cbbe6a2eca8d25df6645b24a5c4e23f8aec4d1d`	pdf-javascript-stream	PDF /JS object 24 at offset 0x8D1	11087 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 long base64-like blob(s).

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