PDF / .PHP malware analysis — malicious · becb06139c33e1eb

MALICIOUS

PDF / .PHP

39.0 KB Created: h0¡zßª`ÛAhÛÌRáR Authoring application: Òõ5ÒKP6þP$] (via Òõ5ÁKZ6ûP$]')

MD5: c5de480ee118cc7234b2ce2cb641bfe9 SHA-1: eaf2e15407c789adf9254668575601f2bae32b36 SHA-256: becb06139c33e1eb14e2e1b8046b5869c277e90e5e9a955748d731ba867a0e1e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file is identified as malicious due to the presence of encrypted JavaScript, which is a common technique to obscure malicious payloads. The heuristic 'PDF_ENCRYPTED_WITH_JS' indicates that the payload is hidden from static analysis. The embedded JavaScript stream, although not directly readable due to obfuscation, is the likely mechanism for executing the malicious action. The file's SHA256 hash is becb06139c33e1eb14e2e1b8046b5869c277e90e5e9a955748d731ba867a0e1e.

Heuristics 4

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

PDF declares /Encrypt and also references an executable trigger (/JavaScript). 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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `7b6fdc429683b1e291ce482f847f3d81ae2258b74d59120ce7d255da5ae75045`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3BE	37252 bytes

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