PDF malware analysis — malicious · b7e60cc418c1e7e4

MALICIOUS

PDF

12.2 KB Created: 2010-12-25 12:48:08 +03:00 Authoring application: vjNKPV8 (via 16e12822)

MD5: 860927ddc5dba38a14a97e10d78e9e79 SHA-1: da731c66bd64877cd8cdf1857754ff0b11ee7a0a SHA-256: b7e60cc418c1e7e40a53ee60e29887bcc4e5b13c10b7fc5c72c3829881812f87

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with one stream exhibiting suspicious eval() and String.fromCharCode() calls. These techniques are commonly used to obfuscate and execute malicious code. The presence of these JavaScript actions strongly suggests the document's intent is to download and execute a secondary payload, making the family unknown but the attack pattern clear. The extracted JavaScript files are listed as IOCs.

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)
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
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `62cf34f38c8dfbdee5e6005e841b6b7bd52f833f4bd0823ee88176746fc212b2`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24B1	2341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `c7cd44ab43f6cccdcf6a91a28a250940279986b06ac4c989abb1c351794cec8e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x28E6	1076 bytes
`javascript_obj0015_002.js` `daf69d179b73305d47b36a429b2ab41dff89a8c7358b730676c95bd325a4b722`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2B58	284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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