PDF malware analysis — malicious · 9c241679fd22bb52

MALICIOUS

PDF

1.95 MB Created: 2011-04-05 23:46:28 Authoring application: bfub loab

MD5: 52eaf508240dcd322b1a2e7150e36e25 SHA-1: d684b6b03a2b4f6598172688032ee1b97ada1746 SHA-256: 9c241679fd22bb5281e6f2eee7b63f0bf54a7093132f52223c0066f49e2b5579

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The unescape() call suggests obfuscation, and the embedded JavaScript file (stream_001_off00000334.js) is the primary artifact. This script is likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. The XFA form further increases the risk by allowing executable scripts.

Heuristics 6

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off00000334.js` `64e77dc985fed8becc8ba174e4bf9b4e890f314a233810679170523ce10dcbe2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x334	56130 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).

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