PDF malware analysis — malicious · 32eb870bd690fbb7

MALICIOUS

PDF

4.3 KB

MD5: 113d608a05dc2f465b0015836471ac2d SHA-1: fc9a3ee349a6e45459103241a6970ac8afd58ecb SHA-256: 32eb870bd690fbb74ca473d605262b05acd0091d008652caa0c4d4d6488e87ca

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed via a CVE-2008-2992 exploit. The heuristic firings indicate the use of eval() and String.fromCharCode, suggesting obfuscated JavaScript is used to download and execute a second-stage payload. The presence of two JavaScript files, one labeled 'numeric_charcode_stage_000.js', further supports this. The document body is unreadable, so the rationale is based solely on the script execution.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
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)
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_obj0005_000.js` `b1f70b49044851430b7ad0e8a8ada724e57031373439d8a5a6bec503894c0bd3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22430 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `2757aa0f2f2f222abca37356e24559ded04b479448ac01d8cd317e7a505d8be5`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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