PDF malware analysis — malicious · 193bc489b5decfb0

MALICIOUS

PDF

9.9 KB Created: @ð¦ôh+¨Öz* Authoring application: °ßô¸++µÉz) (via °ßô¸+JßvÇÏJiÀ¼7H<~A#ø4)

MD5: d50890387cec98a35ca85c03dc636244 SHA-1: 4ade3a99f495f085772dc2cd388e3ee7e332bfa1 SHA-256: 193bc489b5decfb0a131490daa2158c5753438a1eefd7bb3d835a90fffaaefde

88 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by a machine learning classifier and exhibits characteristics of obfuscated JavaScript. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JAVASCRIPT heuristics indicates that the JavaScript is used to conceal the actual malicious content, likely to download and execute a secondary payload. No specific family could be identified due to the obfuscation.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_001.js` `dd1295e271ea081afe92ebd3e814efb0fd1109bdd0c11ef11c7b36493e5d4f0c`	pdf-javascript-stream	PDF /JS object 27 at offset 0xA37	6594 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).
`javascript_obj0025_001.js` `c9f9d158eb55a4afa9f839566f7cef2d0cc827baa8aebbc970753e5166696fda`	pdf-javascript-stream	PDF /JS object 25 at offset 0x8D3	6594 bytes

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