PDF malware analysis — malicious · 3cf65e0d058d9a67

MALICIOUS

PDF

7.3 KB

MD5: 7a4077fb3f669f1acbecc029707c0860 SHA-1: 765a77cbf0e741314b2f1bd748f8a6ef49ca03d6 SHA-256: 3cf65e0d058d9a67edfdafb0909947b646268fe0072038b79f3dac23bc869166

74 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' firing specifically points to the use of eval(), a common technique for obfuscating malicious code. The presence of 'String.fromCharCode' further suggests code construction within the script. While the exact payload is not discernible from the provided evidence, the overall pattern strongly suggests the execution of a malicious script designed to download and execute further stages. The document body was unreadable, preventing a more specific assessment of the lure.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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)
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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
`javascript_obj0007_000.js` `307b9f449415a47104be4e8ea8cbcd2b6e67f4512180d3fe33691240c06d432b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	86 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`deobfuscated.js` `7de98590861ff41cbe3e4a6b11c3d2d31e1c830b090536ae866055dc683330ca`	deobfuscated-js	PDF JavaScript deobfuscation pass	19967 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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