PDF malware analysis — malicious · 80a42f6d31355bb7

MALICIOUS

PDF

11.4 KB Created: 2010-12-22 19:19:49 +03:00 Authoring application: Bm___0z (via 2bd1773)

MD5: 4f1f03300beeb0014f0e1ea171e2eade SHA-1: 99b52a95ef80e524cf7e1129b4a00faca74c1709 SHA-256: 80a42f6d31355bb7b582503d5bf2afae9a09bc170a0934787bde74b2d91aa67e

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. One of the embedded JavaScript files, javascript_obj0011_000.js, is particularly large and likely contains the primary malicious logic. The presence of these obfuscated scripts strongly suggests the document's purpose is to execute arbitrary code, likely for downloading and running a second-stage payload. The specific family could not be determined due to the heavy obfuscation.

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` `fb711beb3b06e4d45f75cdc6d77defff9dfab0d1babfbbc0b9e864c73a1495e3`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2421	1126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `04d0051d5c3f0b87c081ceaf3a33bf1af9d1faa7a72f6400576a614ada32d1a8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x26A0	509 bytes
`javascript_obj0015_002.js` `ad27b66c77d6b89f125746e1c255735ce3227f14274a0d38fa4db4e1cb6dd370`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2846	131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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