PDF malware analysis — malicious · e907fa20a1403dfd

MALICIOUS

PDF

12.3 KB Created: 2010-12-20 19:19:35 +03:00 Authoring application: wGTyd_ (via 37c764)

MD5: 513f5700f9787169159de147d36908f9 SHA-1: 3e05bb794219fd4bf802da30ce6fde54923ecd6f SHA-256: e907fa20a1403dfd2d29cc76adb7851faf5c0f9c857779ccccdecb390f476b34

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with one stream exhibiting obfuscation and the use of eval(). This strongly suggests the execution of malicious JavaScript code. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, indicated by the eval() call and the nature of the extracted JavaScript files. The document body is unreadable, so the rationale is based solely on the script analysis.

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` `435dc862496d5134bb0e362060448fb3467334af70cd08e2a7a82b7790be0bf5`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24E7	2387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `003cd5131e3906d66484838606206cf49b360feb9bb7de5cca44cc3e1e756dec`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2929	1108 bytes
`javascript_obj0015_002.js` `c32fd60b08c17fe208144254344666f4dcf6b0bc8abb19f393a653c1d1727b68`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2BA4	333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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