PDF malware analysis — malicious · 90e8f09bdc4a9eda

MALICIOUS

PDF

36.5 KB Created: ñ[~È/æèbÿ£áÑ1ó Mµ7aÒHYá}ävG`Lk½UC¾

MD5: bc22dca848510df2f579404eff875b6e SHA-1: 3fe9bae20b2174c337a5e3b3549b2ba3145a88a6 SHA-256: 90e8f09bdc4a9eda833af2ef8e989d64860171e905f6d17109d51b6615d5ab7e

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript action and embedded JS stream indicate that the document is designed to execute code. The presence of an encrypted PDF with an OpenAction further suggests an attempt to hide malicious content from static analysis. The embedded artifact 'smS_sKCXqKni0' is also suspicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`smS_sKCXqKni0` `557611cca13a45aa54db96d1a5e1783f025f83defccc9a3e51756e15fbcf91eb`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1559	27952 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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