PDF malware analysis — malicious · b5af4627176d7ed6

MALICIOUS

PDF

37.7 KB

MD5: fae11108af56b19c7adbf65dabdd51eb SHA-1: e0bd4c75c088fe6dcc24035c30b26bc5d963ac8c SHA-256: b5af4627176d7ed6e4422a0c8f247429758ae98f154d7d702a97eb019a90c616

124 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged as malicious by an ML classifier and exhibits several suspicious characteristics, including embedded JavaScript and a Flash object. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is highly likely to be responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The presence of PDF-specific exploit indicators further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
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
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAC9	55839 bytes
`javascript_obj0006_000.js` `31411bbf0631999a4fe1f82996dfef38a1dbb0c4b5b24d7d74fc97dbb53db1d8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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