PDF malware analysis — malicious · 3d2e43316407225e

MALICIOUS

PDF

21.3 KB

MD5: 5d4d589e7aef231d396bd56136e34354 SHA-1: fe46136d21e49616a3cdfc5a679703c1c08c040f SHA-256: 3d2e43316407225ee920cb511a840dfafab490304fa3ffb01ed45673f5cdaf1a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the eval() function and string concatenation to obfuscate its true purpose. The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known vulnerability in Adobe Reader via the Collab.collectEmailInfo function. The deobfuscated JavaScript streams suggest the script is designed to download and execute a second-stage payload, which is a common technique for initial access and further infection.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `6f7c113f1d88f1c8721c691f645329fe84049c1dd83be55915e369e290545587`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `be5cec493f3f442fb2c7ec6e719ecda347633b3803405db7790bd5659005f67c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11A1	15599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `3183234030c482a9bd3fa99dfbd53feb18d8929f31dc3e799b4bed821994761d`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4EC6	1563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `8e1c90d6bca57695856c1f4e6a87737c3ab1c5a594338d6727c6af2e75189f8a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x11A1	1473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `d0becd1087cb3d86bab9f0419e9c32785f32825578449f1390cda685ad224437`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4EC6	86 bytes
`legacy_pdfkit_stage_002.js` `1b232f7f69dff9ac0374886eed13b18cf902d5e81a989f62128c8294af67a0e2`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x11A1	1560 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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